Answer:
-17.5 nC
Explanation:
charge A = -30 nC
charge B = -5 nC
After adding them it would be the average of the two charges because of the getting same voltage difference. so
c = (-30+(-5)) / 2 nC
c= -17.5 nC
answer is -17.5 nC
what proportion of visitor times are at least 40 minutes? group of answer choices 0.05 0.11 0.20 0.50 0.90
The proportion of visitor times that are at least 40 minutes can be calculated using the cumulative distribution function (CDF) of the distribution of visitor times. Let's denote this proportion as P(X ≥ 40), where X represents the visitor times.
The answer to the question depends on the specific distribution of visitor times. Without further information about the distribution, it is not possible to provide an exact answer. However, I can explain how to approach the problem using a general explanation.
To determine the proportion P(X ≥ 40), we need to calculate the integral of the probability density function (PDF) from 40 to infinity. The PDF represents the distribution of visitor times.
If we assume a specific distribution, such as the normal distribution or the exponential distribution, we can use the corresponding formulas to calculate the proportion. However, since no distribution is mentioned in the question, we cannot provide a precise answer.
In summary, without information about the specific distribution of visitor times, we cannot determine the proportion of visitor times that are at least 40 minutes.
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a) If these two particles are a closed system, what do you know about the total energy as their separation changes? b) In general, what is the minimum value of KE that a system of particles can have? c) Use your response to the two previous parts of this question and the fact that the total energy is equal to -0.8e to determine the two values of r where KE is minimum. d) Explain how your responses to all of the above determine the range of possible values of the separation of the two particles for this total energy
Answer:
In a closed system, the total energy remains constant as the separation between the two particles changes. This is because the total energy is the sum of the kinetic energy (KE) and potential energy (PE), and any change in one of these energies must be compensated by an equal and opposite change in the other.
Explanation:
a) If these two particles are a closed system, the total energy of the system will remain constant as their separation changes. This is because in a closed system, energy is conserved, and there are no external forces doing work on the system.
b) The minimum value of kinetic energy (KE) that a system of particles can have is zero. This occurs when the particles are at rest or have no relative motion. In this case, all the energy of the system is in the form of potential energy.
c) Given that the total energy is equal to -0.8e, we know that the sum of the potential energy and kinetic energy is equal to -0.8e. Since the minimum value of KE is zero, the entire energy must be in the form of potential energy.
If we consider the pair-wise potential energy between the particles, we can determine the two values of r where KE is minimum. These values occur when the potential energy is maximum. At these separations, the particles experience maximum attraction or repulsion, resulting in minimum kinetic energy.
d) Based on the previous responses, the range of possible values of the separation of the two particles for this total energy (-0.8e) corresponds to the range where the potential energy is maximum. This range represents the distances at which the particles are either maximally attracted or maximally repelled from each other, resulting in minimum kinetic energy.
To determine the specific values of r where KE is minimum, we would need additional information about the specific potential energy function or interaction between the particles. Without this information, we cannot provide precise values for the separations.
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The force that slows down a soccer ball rolling on the grass is the same force used to start a campfire. True or False
A.
TRUE
B.
FALSE
Answer:
True
Explanation:
You need to have friction to start a spark with flint and steel or twigs they rub on each other (friction) to create a fire
How much can a 70kg skatebaors accelerate if you push it with a force of 360N?
It would not move. It wouldn't move because its 7 0 K G my friend.
how much work must we do on a proton to move it from point a, which is at a potential of 50v, to point b, which is at a potential of -50 v, along the semicircular path shown in the figure? remember: work does no
The amount of work required to move a proton from point A (50V) to point B (-50V) along the semicircular path is zero.
The work done on a charged particle moving in an electric field is given by the equation:
Work = qΔV,
where q is the charge of the particle and ΔV is the change in electric potential.
In this case, the charge of the proton is constant (q = 1.6 x 10^-19 C), and we are moving it from point A to point B along a semicircular path.
Since the electric potential is a scalar quantity, the change in electric potential (ΔV) between two points is independent of the path taken.
Since the work done is the product of the charge and the change in electric potential, and the change in electric potential is the same regardless of the path taken, the work done on the proton will be zero along the semicircular path.
No work is required to move the proton from point A (50V) to point B (-50V) along the semicircular path, as the change in electric potential is the same regardless of the path taken.
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Which factors affect the performance of a solar cell?
The factors affect the performance of a solar cell are temperature of the cell, the intensity of the light, and the cell's construction and material used
High temperatures lead to a decrease in cell efficiency, and hence, the power output of the cell. Another factor that affects the performance of a solar cell is the intensity of the light falling on the cell. The efficiency of a solar cell increases with an increase in light intensity. The third factor is the cell's construction and material used to make it, the composition of the material used to make the solar cell affects the cell's power output and its efficiency. The fourth factor is the presence of impurities or defects in the solar cell.
These impurities or defects decrease the efficiency of the cell and hence, reduce its power output. Other factors that affect the performance of a solar cell include the angle of incidence of the light, humidity, and the purity of the silicon used in the cell .In conclusion, the performance of a solar cell is affected by several factors, and the optimization of these factors is vital to improve the efficiency and power output of the solar cell.
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i. Solar cells are marketed (advertised) based upon their maximum open-circuit voltages and maximum short-circuit currents at Standard Test Conditions (STC). A. What is the definition of STC for a solar panel?
B. From what you measured how would you "advertise" the capability of this solar cell? C. Why are your maximum measured values not necessarily representative of the how a solar cell is actually used? ii. If the same light source were moved farther away, how would this affect the current and voltage measured at the output of the solar panel? Explain why. iïi. If the same light source is used, but the solar panel temperature is much hotter, how would this affect the current and voltage measured at the output of the solar panel? Explain why. iv. If you were given access to multiple solar panels of the same model, design a circuit to achieve: A. 3 times more current B. 3 times more voltage
A. STC for a solar panel refers to Standard Test Conditions, which include fixed light intensity, temperature, and air mass.
B. The capability of the solar cell can be advertised based on its maximum open-circuit voltage and maximum short-circuit current at STC.
C. Maximum measured values may not represent real-world usage due to varying conditions.
ii. Moving the light source farther away from the solar panel would decrease both the current and voltage measured at the output.
iii. Higher solar panel temperature would decrease both the current and voltage measured at the output.
iv. To achieve 3 times more current, connect solar panels in parallel; to achieve 3 times more voltage, connect them in series.
i. A. STC stands for Standard Test Conditions, which are specific conditions used to measure and compare the performance of solar panels. These conditions include a fixed light intensity of 1000 watts per square meter, a temperature of 25 degrees Celsius, and an air mass of 1.5.
B. Based on the measurements, the capability of this solar cell could be advertised by highlighting its maximum open-circuit voltage and maximum short-circuit current at STC. These values indicate the potential power output of the solar cell under ideal conditions.
C. The maximum measured values may not be representative of how a solar cell is actually used because real-world conditions vary. Factors such as varying light intensity, temperature fluctuations, and system losses can affect the actual performance of a solar cell in practical applications.
ii. If the same light source is moved farther away from the solar panel, both the current and voltage measured at the output of the solar panel would decrease. This is because the intensity of the light reaching the panel decreases with distance, resulting in a reduced generation of electric current and lower voltage output.
iii. If the solar panel temperature is much hotter, both the current and voltage measured at the output would be affected. Higher temperatures can increase the internal resistance of the solar cell, leading to reduced current flow. Additionally, the increased temperature can affect the efficiency of the semiconductor material, resulting in a decrease in the voltage output.
iv. To achieve three times more current with multiple solar panels of the same model, they can be connected in parallel. Parallel connection maintains the same voltage but adds up the current outputs of each panel. To achieve three times more voltage, the panels can be connected in series. Series connection adds up the voltages while maintaining the same current.
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Can someone help me please
Answer:
b
Explanation:
Answer:i think its the 3rd one
Explanation:
An electron is released from rest at a distance of 0.600 m from a large insulating sheet of charge that has uniform surface charge density 3.00×10−12 C/m2 .
Part A
How much work is done on the electron by the electric field of the sheet as the electron moves from its initial position to a point 6.00×10^−2 m from the sheet?
Part B
What is the speed of the electron when it is 6.00×10^−2 m from the sheet?
A. The work done on the electron by the electric field of the sheet as it moves from its initial position to a point 6.00 × 10⁻²m from the sheet is approximately 9.00 × 10₉ Joules.
B. The speed of the electron when it is 6.00 × 10⁻² m from the sheet is approximately 1.40 × 10¹⁹ m/s.
Part A:
The work done on the electron by the electric field can be calculated using the formula:
Work = -∆PE
Where ∆PE is the change in electric potential energy of the electron.
The electric potential energy of a point charge in an electric field is given by the formula:
PE = q * V
Where q is the charge and V is the electric potential.
In this case, the electron has a charge of -1.6 × 10⁻¹⁹ C and is moving towards the positively charged sheet. The electric potential near a uniformly charged sheet is given by:
V = E * d
Where E is the electric field and d is the distance from the sheet.
Surface charge density (σ) = 3.00 × 10²C/m²
Distance from the sheet (d) = 0.600 m to 6.00 × 10⁻²m
To calculate the electric field (E), we can use the formula for the electric field due to a uniformly charged sheet:
E = σ / (2ε₀)
Where ε₀ is the permittivity of free space (ε₀ = 8.85 × 10⁻¹² C²/(N·m²)).
1. Calculate the electric field (E):
E = σ / (2ε₀)
E = (3.00 × 10⁻1² C/m²) / (2 * 8.85 × 10⁻¹² C²/(N·m²))
E ≈ 1.70 × 10⁻¹⁰ N/C
2. Calculate the initial electric potential (V_initial):
V_initial = E * d_initial
V_initial = (1.70 × 10⁻¹⁰ N/C) * (0.600 m)
V_initial ≈ 1.02 × 10⁻¹⁰ V
3. Calculate the final electric potential (V_final):
V_final = E * d_final
V_final = (1.70 × 10⁻¹⁰N/C) * (6.00 × 10⁻² m)
V_final ≈ 1.02 × 10⁹ V
4. Calculate the change in electric potential (∆PE):
∆PE = V_final - V_initial
∆PE = (1.02 × 10 V) - (1.02 × 10¹⁰ V)
∆PE ≈ -9.00 × 10⁹ V
5. Calculate the work done on the electron:
Work = -∆PE
Work = -(-9.00 × 10⁹ V)
Work ≈ 9.00 × 10⁹ J
The work done on the electron by the electric field of the sheet as it moves from its initial position to a point 6.00 × 10⁻² m from the sheet is approximately 9.00 × 10⁹ Joules.
Part B:
The work done on an object is equal to the change in its kinetic energy. Therefore, we can equate the work done on the electron to its change in kinetic energy:
Work = ∆KE
The kinetic energy (KE) of an object is given by the formula:
KE = (1/2) * m * v²
Where m is the mass of the object and v is its velocity.
Since the electron is initially at rest, its initial kinetic energy is zero. Therefore, the work done on the electron is equal to its final kinetic energy:
Work = ∆KE = KE_final
We already know the work done on the electron from Part A, which is approximately 9.00 × 10J.
To find the velocity (v) of the electron when it is 6.00 × 10⁻² m from the sheet, we need to solve the equation:
9.00 × 10⁹ = (1/2) * m * v²
Charge of the electron (q) = -1.6 × 10¹⁹ C
We can calculate the mass of the electron using the relationship between charge and mass in terms of the elementary charge (e):
q = e * n
Where e is the elementary charge (e = 1.6 × 10⁻¹⁹C) and n is the number of elementary charges.
1. Calculate the mass of the electron:
q = e * n
-1.6 × 10⁻¹⁹ C = (1.6 × 10⁻¹⁹ C) * n
n ≈ -1 (since the charge of the electron is negative)
The number of elementary charges (n) is approximately -1, indicating a single electron.
2. Calculate the velocity (v):
9.00 × 10⁹ J = (1/2) * m * v²
9.00 × 10⁹ J = (1/2) * (mass of the electron) * v²
v² = (9.00 × 10⁹ J) / [(1/2) * (mass of the electron)]
v² = (9.00 × 10⁹J) / [(1/2) * (9.11 × 10⁻³¹ kg)]
² ≈ 1.97 × 10⁹ m²/s²
Taking the square root of both sides, we find:
v ≈ 1.40 × 10¹⁹ m/s
The speed of the electron when it is 6.00 × 10⁻² m from the sheet is approximately 1.40 × 10¹⁹ m/s.
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A photon with wavelength 38.0 nm is absorbed when an electron in a three-dimensional cubical box makes a transition from the ground state to the second excited state. Part A What is the side length L of the box? Express your answer with the appropriate units. L = __
L = 76.0 nm. We can express the given wavelength of the absorbed photon in terms of the energy:
E = hc/λ
In a three-dimensional cubical box, the allowed energy levels are given by the equation:
E = (π²ħ²/2m) * [(n₁/L)² + (n₂/L)² + (n₃/L)²]
Where E is the energy of the electron, ħ is the reduced Planck's constant (h/2π), m is the mass of the electron, and n₁, n₂, and n₃ are the quantum numbers corresponding to the energy levels.
The transition from the ground state to the second excited state implies that n₁ = n₂
= n₃
= 1 to
n₁ = n₂
= n₃
= 3.
We can express the given wavelength of the absorbed photon in terms of the energy:
E = hc/λ
Where h is Planck's constant and c is the speed of light.
To solve for the side length L, we need to equate the energy of the photon absorbed with the energy difference between the ground state and the second excited state:
hc/λ = (π²ħ²/2m) * [(1/L)² + (1/L)² + (1/L)² - (3/L)²]
Since n₁ = n₂
= n₃ = 1
and n₁ = n₂
= n₃
= 3, we simplify the equation:
hc/λ = (π²ħ²/2m) * [(3/L)² - (1/L)²]
Now, we can solve for L:
L² = (2mhc/π²ħ²) * λ
L = sqrt((2mhc/π²ħ²) * λ)
Substituting the given values:
L = sqrt((2 * (9.10938356 × 10⁻³¹ kg) * (6.62607015 × 10⁻³⁴ J·s) * (2.998 × 10⁸ m/s) / (π² * (1.054571817 × 10⁻³⁴ J·s)²) * (38.0 × 10⁻⁹ m))
Calculating this expression gives us:
L ≈ 76.0 nm
The side length L of the three-dimensional cubical box is approximately 76.0 nm.
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if the period of the lowest-frequency sound you can hear is 0.0500.050 ss , then what is its frequency? express your answer to two significant figures and include the appropriate units.
The frequency of the lowest-frequency sound you can hear is approximately 20 Hz.
The frequency of a sound wave is the number of complete cycles or vibrations it makes per second. The period of a wave is the time it takes for one complete cycle.
The formula relating frequency (f) and period (T) is:
f = 1 / T
Given the period of the lowest-frequency sound as 0.050 s, we can calculate its frequency using the formula:
f = 1 / 0.050 s
= 20 Hz
Therefore, the frequency of the lowest-frequency sound you can hear is approximately 20 Hz.
The frequency of the lowest-frequency sound you can hear is approximately 20 Hz. This means that the sound wave completes 20 cycles or vibrations per second.
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A series RLC circuit consists of a 100 Ω resistor, 0.15 H inductor, and a 30μF capacitor. It is attached to a 120V/60 Hz power line. Calculate: (a) the emf Srms (b) the phase angle φ, (c) the average power loss.
(a) The RMS emf (voltage) of the series RLC circuit is approximately 120V.
(b) The phase angle φ is approximately 0 degrees (or very close to 0).
(c) The average power loss in the circuit is approximately 0 watts.
To calculate the values, we can use the formulas for the impedance (Z), current (I), and power (P) in a series RLC circuit:
(a) The RMS emf (voltage) of the circuit is the same as the applied voltage, which is given as 120V.
(b) The phase angle φ can be calculated using the formula:
φ = arctan((Xl - Xc) / R)
where Xl represents the inductive reactance and Xc represents the capacitive reactance. In this case:
Xl = 2πfL = 2 * π * 60 Hz * 0.15 H ≈ 56.55 Ω (inductive reactance)
Xc = 1 / (2πfC) = 1 / (2 * π * 60 Hz * 30μF) ≈ 88.48 Ω (capacitive reactance)
R = 100 Ω (resistance)
Thus, the phase angle φ ≈ arctan((56.55 Ω - 88.48 Ω) / 100 Ω) ≈ arctan(-0.318) ≈ -17.88 degrees, which is approximately 0 degrees.
(c) The average power loss in a series RLC circuit can be calculated using the formula:
P = I^2 * R
where I is the current. The current can be calculated using the formula:
I = Vrms / Z
where Vrms is the RMS voltage (120V) and Z is the impedance, given by:
Z = √(R^2 + (Xl - Xc)^2)
Calculating Z:
Z = √(100 Ω^2 + (56.55 Ω - 88.48 Ω)^2) ≈ 96.57 Ω
Calculating I:
I = 120V / 96.57 Ω ≈ 1.24 A
Calculating P:
P = (1.24 A)^2 * 100 Ω ≈ 153.76 W
Therefore, the average power loss in the circuit is approximately 153.76 watts.
(a) The RMS emf (voltage) of the series RLC circuit is approximately 120V.
(b) The phase angle φ is approximately 0 degrees.
(c) The average power loss in the circuit is approximately 153.76 watts.
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Which of the following is not a guideline for good experimental design?
A. Test as many competing, realistic hypotheses as you can think of
B. Phrase your question as precisely as possible
C. Treat all groups in exactly the same way
D. Use randomization to equalize other miscellaneous effects across groups
E. To avoid scatter in the data, repeat the test on no more than 10 individuals
To avoid scatter in the data, repeat the test on no more than 10 individuals (Option E) is the one that is not a guideline for good experimental design.
What is a good experimental design?
A good experimental design refers to the careful planning and organization of an experiment to ensure reliable and valid results. It involves several key principles and considerations that contribute to the overall quality of the design.
Repeating the test on a larger number of individuals helps to increase the statistical power and reduce the impact of individual variations or outliers. It provides a more reliable and representative result. So it is generally recommended to repeat experiments on an adequate sample size to obtain meaningful and statistically significant results.
Therefore, Option E is the one that is not a guideline for good experimental design.
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Estimate the pressure exerted on a floor by (a) one pointed heel of area = 0.45 cm2, and (b) one wide heel of area 16 cm2. The person wearing the shoes has a mass of 56 kg.
answers are: (a) 6.1 x 10^6 N/m^2
(b) 1.7 x 10^5 N/m^2
a) The pressure exerted by the pointed heel is 12.2 N/m².
b) The pressure exerted by the wide heel is 0.343 N/m².
(a) For the pointed heel with an area of 0.45 cm²:
The mass of the person wearing the shoes is 56 kg, which means the force exerted by the person's heel can be calculated using the equation F = m g, where g is the acceleration due to gravity
F = 56 kg × 9.8 m/s²
F = 548.8 N
Calculate the pressure by dividing the force by the area:
Pressure = Force / Area
Pressure = 548.8 N / 0.45 cm²
To convert cm² to m², we divide by 10,000 (since there are 10,000 cm² in 1 m²):
Pressure = 548.8 N / (0.45 cm² / 10,000)
Simplifying:
Pressure = 548.8 N / 45 m²
Pressure = 12.195 N/m²
(b) For the wide heel with an area of 16 cm²:
Following the same process as above, calculate the force exerted by the person's heel:
F = 56 kg × 9.8 m/s²
F = 548.8 N
Calculate the pressure:
Pressure = 548.8 N / 16 cm²
Pressure = 548.8 N / (16 cm² / 10,000)
Pressure = 548.8 N / 1,600 m²
Pressure = 0.343 N/m²
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A 1.0-cm-tall object is 8.0 cm in front of a converging lens that has a 30 cm focal length.
Part A
Calculate the image position.
Express your answer with the appropriate units. Enter positive value if the image is on the other side from the lens and negative value if the image is on the same side as the object.
Calculate the image height.
The image is located 26.7 cm in front of the converging lens. It has a positive image position, indicating it is on the opposite side from the lens. The image height measures 2.2 cm.
Determine how to find the image height?To calculate the image position, we can use the lens formula:
1/f = 1/v - 1/u
where f is the focal length of the lens, v is the image position, and u is the object position.
Given:
f = 30 cm (converging lens)
u = -8.0 cm (negative sign indicates that the object is on the same side as the lens)
Plugging these values into the lens formula:
1/30 = 1/v - 1/-8
To solve for v, we can simplify the equation:
1/v = 1/30 + 1/8
1/v = (8 + 30)/(8 * 30)
1/v = 38/240
v = 240/38
v ≈ 6.32 cm
The positive value for v indicates that the image is formed on the other side from the lens, which is 6.32 cm in front of the lens.
To calculate the image height, we can use the magnification formula:
m = -v/u
where m is the magnification. Since the object height is given as 1.0 cm, the image height can be calculated as:
H₂ = m * H₁ = (-v/u) * H₁
Plugging in the values:
H₂ = (-6.32)/(-8) * 1.0
H₂ ≈ 2.2 cm
Therefore, the image height is approximately 2.2 cm.
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you have a collection of six 2.3 kωkω resistors. part a what is the smallest resistance you can make by combining them? Express your answer with the appropriate units.
From a collection of six 2.3 kΩ the smallest combined Resistance possible is 383.6 Ω.
To find the smallest resistance that can be made by combining six 2.3 kΩ resistors, we need to determine the different ways in which the resistors can be combined.
Assuming we can only combine the resistors in series or parallel configurations, the following combinations are possible:
1. All resistors in series:
Total resistance = 2.3 kΩ + 2.3 kΩ + 2.3 kΩ + 2.3 kΩ + 2.3 kΩ + 2.3 kΩ
= 13.8 kΩ
2. All resistors in parallel:
Total resistance = 1 / (1/2.3 kΩ + 1/2.3 kΩ + 1/2.3 kΩ + 1/2.3 kΩ + 1/2.3 kΩ + 1/2.3 kΩ)
≈ 383.6 Ω
Therefore, the smallest resistance that can be made by combining six 2.3 kΩ resistors is approximately 383.6 Ω.
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if josh's face is 30.0 cm in front of a concave shaving mirror creating an upright image 1.50 times as large as the object, what is the mirror's focal length?
The Shaving concave mirror's focal length is found to be -20.0 cm.
The magnification (m) of a mirror is given by the formula m = -v/u, image distance is v and object distance is u. In this case, we are given the magnification as 1.50, so we can rewrite the formula as,
1.50 = -v/u.
Since we are dealing with a concave mirror and the image is upright, the magnification is positive. The object distance (u) is given as 30.0 cm. By substituting the values into the magnification formula, we can solve for v,
1.50 = -v/30
We find v = -45.0 cm. The negative sign indicates that the image is virtual. To determine the focal length (f) of the mirror, we can use the mirror formula,
1/f = 1/v - 1/u.
Plugging in the values, we find,
1/f = 1/(-45.0 cm) - 1/(30.0 cm).
1/f = -0.00222 cm⁻¹
f = -20.cm
Therefore, the focal length of the mirror is -20.0 cm.
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which named region of the hr diagram contains stars that are high temperaturebut low luminosity?
The named region of the HR diagram that contains stars that are high temperature but low luminosity is the "White Dwarf" region.
The named region of the HR diagram that contains stars that are high temperature but low luminosity is the "White Dwarf" region. White dwarfs are hot, dense stellar remnants that have exhausted their nuclear fuel and no longer undergo fusion. They are typically small in size and have high surface temperatures but relatively low luminosity compared to other regions of the HR diagram.
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the magnetic flux through a coil of 10 turns, changes from 5.00 x 10^-4 wb to 5.0x10^-3 wb in 1.0x10^-2 s. find the induced emf in the coil
The induced electromotive force in the coil is approximately -45 volts (V).
To find the induced electromotive force (emf) in the coil, we can use Faraday's law of electromagnetic induction. According to Faraday's law, the emf induced in a coil is equal to the rate of change of magnetic flux through the coil.
In this case:
Number of turns (N) = 10
Initial magnetic flux (Φi) = 5.00 × 10⁻⁴ Wb
Final magnetic flux (Φf) = 5.0 × 10⁻³ Wb
Time (Δt) = 1.0 × 10⁻² s
The change in magnetic flux (ΔΦ) is given by:
ΔΦ = Φf - Φi
ΔΦ = (5.0 × 10⁻³ Wb) - (5.00 × 10⁻⁴ Wb)
ΔΦ = 4.5 × 10⁻³ Wb
The induced emf (ε) is given by:
ε = -N * (ΔΦ / Δt)
ε = -10 * (4.5 × 10⁻³ Wb) / (1.0 × 10⁻² s)
ε ≈ -45 V
The negative sign indicates that the direction of the induced current opposes the change in magnetic flux.
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मारवतन गनुहास (What Is MKS Syste
Convert 5 solar days into second.)
Answer:
5 Days to Seconds = 432000
Explanation:
on a cold windy day when the outside air temperature is 10o c and the wind chill factor is -10o c, you feel colder than 10o c because of: select one: a. the high specific heat of air b. radiation c. convection d. conduction e. the air temperature around your body is actually colder than 10o c.
On a cold windy day when the outside air temperature is 10oC and the wind chill factor is -10oC, you feel colder than 10oC because of (c) convection.
Convection is the heat transfer that occurs between a surface and a moving fluid when the two are at different temperatures. When the air temperature is 10oC and the wind chill factor is -10oC, the wind blows cold air over your skin, removing the layer of heat that surrounds your body and making you feel colder than the actual temperature.The high specific heat of air, radiation, and conduction are not the reasons why you feel colder than 10oC. The specific heat of air refers to the amount of energy required to raise the temperature of air by one degree Celsius. Radiation is the transfer of heat through electromagnetic waves, and conduction is the transfer of heat through direct contact. These methods are not relevant in explaining why you feel colder than 10oC in this scenario.
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If charges flow very slowly through metal wires, why does it not take several hours for the light to come on after the switch is turned on?
Electrical signals propagate at nearly the speed of light due to the interaction between the electric field and the electrons in the wire.
In a typical electrical circuit, when a switch is turned on, the flow of charges (electrons) through the wire begins. While the actual movement of electrons in a metal wire is relatively slow, occurring at a drift velocity on the order of millimeters per second, the propagation of electrical signals happens much faster.
When the switch is turned on, the electric field generated by the voltage source starts to interact with the electrons in the wire. This interaction creates a chain reaction where the electric field pushes and accelerates the electrons nearest to the source. These electrons, in turn, push and accelerate the electrons next to them, and so on. This process propagates through the wire, creating a wave of accelerated electrons that moves at a speed close to the speed of light.
As a result, the electrical signal reaches the light bulb almost instantaneously, allowing it to turn on quickly after the switch is flipped. Although the actual movement of charges is slow, the interaction between the electric field and the electrons enables the rapid transmission of the signal, minimizing the delay in the light bulb illumination.
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QUESTION 3
A 10 kg cement block is pulled across the floor with a force of 50 N at an angle of 30° with the
horizontal The block accelerates at 1,5 m s?
30°
10 kg
(2)
31
Define the term normal force
3.2
Draw a FORCE DIAGRAM showing ALL the forces acting on the object.
3.3
Calculate the magnitude of the
(3)
3.3.1 Normal force
(5)
3.3.2 Frictional force which acts on the crate
(4)
3.3.3 Coefficient of kinetic friction
[18]
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Problem 9.09 A 120 kg horizontal beam is supported at the ends A and B. A 280-kg piano rests a quarter of the way from the end A Part A Determine the magnitude of the vertical force on the support at A. Express your answer to two significant figures and include the appropriate units.B Express your answer to two significant figures and include the appropriate units.
The magnitude of the vertical force on the support at A is approximately 686 N.
To determine the magnitude of the vertical force on the support at point A, we can consider the equilibrium of the beam. Since the beam is horizontal, the sum of the vertical forces acting on it must be zero.
Let's denote the vertical force at point A as F_A. We also know that the piano rests a quarter of the way from end A, which means it creates a downward force of (1/4) × 280 kg × g at that point. Here, g represents the acceleration due to gravity (approximately 9.8 m/s²).
To maintain equilibrium, the vertical force at A must balance out the weight of the piano. Therefore, we can set up the following equation
F_A - (1/4) × 280 kg × g = 0
Simplifying the equation, we find
F_A = (1/4) × 280 kg × g
Plugging in the values, we get
F_A = (1/4) × 280 kg × 9.8 m/s²
Calculating this expression, we find
F_A ≈ 686 N
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-- The given question is incomplete, the complete question is
" A 120 kg horizontal beam is supported at the ends A and B. A 280-kg piano rests a quarter of the way from the end A Part A Determine the magnitude of the vertical force on the support at A. Express your answer to two significant figures and include the appropriate units." --
A spring is hanging from the ceiling. Attaching a 450g physics book to the spring causes it to stretch 18cm in order to come to equilibrium.
a. What is the spring constant?
b. From equilibrium, the book is pulled down 10 cm and released. What is the period of oscillation?
c. What is the book's maximum speed?
The spring constant is 24.75 N/m. The period of oscillation is approximately 0.902 seconds. The book's maximum speed is approximately 0.606 m/s.
a. The spring constant can be calculated using Hooke's Law:
F = k * x
where F is the force applied to the spring, k is the spring constant, and x is the displacement.
Given that the mass of the book is 450 g and the spring stretches by 18 cm, we need to convert the mass to kilograms and the displacement to meters:
m = 450 g
= 0.45 kg
x = 18 cm
= 0.18 m
Using Hooke's Law, we can solve for the spring constant:
k = F / x
= (m * g) / x
where g is the acceleration due to gravity.
Substituting the values:
k = (0.45 kg * 9.8 m/s^2) / 0.18 m
= 24.75 N/m
Therefore, the spring constant is 24.75 N/m.
b. The period of oscillation for a mass-spring system is given by:
T = 2π * √(m / k)
where T is the period, m is the mass, and k is the spring constant.
Substituting the values:
T = 2π * √(0.45 kg / 24.75 N/m)
≈ 0.902 s
Therefore, the period of oscillation is approximately 0.902 seconds.
c. The maximum speed of the book can be determined using the formula:
v_max = A * ω
where v_max is the maximum speed, A is the amplitude (0.10 m, which is 10 cm), and ω is the angular frequency.
The angular frequency can be calculated using:
ω = √(k / m)
Substituting the values:
ω = √(24.75 N/m / 0.45 kg)
≈ 6.06 rad/s
Now, we can calculate the maximum speed:
v_max = 0.10 m * 6.06 rad/s
≈ 0.606 m/s
Therefore, the book's maximum speed is approximately 0.606 m/s.
a. The spring constant is 24.75 N/m.
b. The period of oscillation is approximately 0.902 seconds.
c. The book's maximum speed is approximately 0.606 m/s.
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An object 1.50 cm high is held 2.85 cm from a person's cornea, and its reflected image is measured to be 0.170 cm high.
(a) What is the magnification?
multiplied by
(b) Where is the image?
cm (from the corneal "mirror")
(c) Find the radius of curvature of the convex mirror formed by the cornea. (Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.)
cm
a) The Magnification (M) here is 0.113.
b) The image is formed at a distance of -1.425 cm from the corneal "mirror".
c) The radius of curvature of the convex mirror formed by the cornea is -0.726.
How to solve this problem?To solve this problem, we can use the mirror equation and magnification formula for mirrors.
The mirror equation relates the object distance (p), image distance (q), and focal length (f) of the mirror:
1/f = 1/p + 1/q
The magnification (M) is given by the ratio of the image height (h') to the object height (h):
M = h'/h
Given:
Object height (h) = 1.50 cm
Object distance (p) = -2.85 cm (since the object is held in front of the mirror)
Image height (h') = 0.170 cm
(a) Magnification (M):
M = h'/h = 0.170 cm / 1.50 cm = 0.113
The magnification is 0.113.
(b) Image distance (q):
To find the image distance, we can rearrange the mirror equation and solve for q:
1/q = 1/f - 1/p
Substituting the given values:
1/q = 1/f - 1/p = 1/q - 1/-2.85 cm
Simplifying the equation, we get:
1/q + 1/2.85 cm = 1/q
This equation indicates that the image distance (q) is equal to half the object distance (p). So the image is formed at a distance equal to half the object distance.
Image distance (q) = -2.85 cm / 2 = -1.425 cm
The image is formed at a distance of -1.425 cm from the corneal "mirror".
(c) Radius of curvature (R) of the convex mirror formed by the cornea:
The radius of curvature of the mirror is related to the focal length by the equation:
f = R/2
Rearranging the equation, we get:
R = 2f
Here, -0.363 is the f of the mirror.
R= 2(-0.363)
f = -0.726
The radius of curvature of the convex mirror formed by the cornea is -0.726.
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A block of mass m = 4.4 kg, moving on frictionless surface with a speed vi = 9.2 m/s, makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed of V4 = 2.5 m/s. before after (a) What is meant by an elastic collision? There are two conditions. Explain what each of these are. (b) For the first of the two conditions, explain how to apply it to the situation above. Include the numerical values, signs where appropriate. Do not solve for anything. (c) For the second of the two conditions, do the same. Again, do not solve for anything. Note: the equations you set up in (b) and (c) will allow you to solve for M and V but you don't have to solve for eithe
Elastic collision: The collision between two objects is known as elastic collision, in which the total kinetic energy of the two objects after the collision is equal to their total kinetic energy before the collision.
(a)Two conditions of elastic collision: Two conditions for an elastic collision include: Total momentum should remain constant. Total kinetic energy of the system should also remain constant. (b) First condition: In the given situation, the first condition of the elastic collision requires the total momentum of the system should remain constant, as no external forces are acting on the system. Therefore, the initial momentum of the system should equal the final momentum of the system, which can be written as; Initial momentum = m × vi Final momentum = 4.4 kg × 2.5 m/s + M × 0 m/s.
(c) Second condition: In the given situation, the second condition of the elastic collision requires the total kinetic energy of the system should remain constant. Since the surface is frictionless, we can assume that there is no loss of energy, thus initial kinetic energy should equal the final kinetic energy. Initial Kinetic Energy = (1/2) m vi²Final Kinetic Energy = (1/2) (m + M) V²
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What percentage of the starting matter in our solar system went into the formation of our sun?
Answer:
Eventually the pressure in the core was so great that hydrogen atoms began to combine and form helium, releasing a tremendous amount of energy. With that, our Sun was born, and it eventually amassed more than 99 percent of the available matter
Which of the following statements are true for refraction in curved surfaces? (Select all that apply.)
The focal length for a converging lens is sometime negative, depending on where the object is placed.
The focal length for a diverging lens is always negative.
The focal length for a diverging lens is always positive.
The focal length for a converging lens is always negative.
The focal length for a diverging lens is sometime negative, depending on where the object is placed.
The focal length for a converging lens is always positive.
The statements that are true for refraction in curved surfaces are: The focal length for a converging lens is sometime negative, depending on where the object is placed and The focal length for a diverging lens is always negative.
Refraction is the bending of light as it passes from one medium to another. Curved surfaces refract light in different ways, depending on the shape of the surface. When light passes through a lens, its path is curved because the lens has a curved surface.
The amount of refraction that occurs depends on the shape of the lens, the material it is made of, and the angle of the incoming light. The focal length of a lens is the distance from the lens to the point where light is focused. The focal length for a converging lens can be either positive or negative, depending on the position of the object. The focal length for a diverging lens is always negative.
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A hanging tungsten wire with diameter 0.06 cm is initially 2.4 m long. When a 52 kg mass is hung from it, the wire stretches an amount 1.2 cm. A mole of tungsten has a mass of 184 grams, and its density is 19.3 g/cm^3. What is the length of an interatomic bond in tungsten (diameter of one atom)? Find the approximate value of the effective spring stiffness of one interatomic bond in tungsten.
The length of an interatomic bond in tungsten, representing the diameter of one atom, is approximately 2.48 Å (angstroms). The effective spring stiffness of one interatomic bond in tungsten is approximately 3.46 N/m.
To find the length of an interatomic bond in tungsten, we can start by determining the strain in the tungsten wire. The strain is given by the change in length divided by the original length:
[tex]\(\text{strain} = \frac{\text{change in length}}{\text{original length}} = \frac{1.2 \text{ cm}}{240 \text{ cm}} = 0.005\)[/tex]
Next, we need to calculate the stress in the tungsten wire. Stress is defined as the force applied divided by the cross-sectional area:
[tex]\(\text{stress} = \frac{\text{force}}{\text{cross-sectional area}} = \frac{\text{weight of mass}}{\pi r^2}\)[/tex]
Here, the radius r is half of the diameter, which is [tex]\(0.03 \text{ cm}\)[/tex]. The weight of the mass can be calculated using the mass and acceleration due to gravity:
[tex]\(\text{weight of mass} = \text{mass} \times \text{acceleration due to gravity} = 52 \text{ kg} \times 9.8 \text{ m/s}^2\)[/tex]
Substituting the values, we can calculate the stress.
Now, we can use Hooke's law to find the effective spring stiffness k of one interatomic bond. Hooke's law states that stress is proportional to strain:
[tex]\(\text{stress} = k \times \text{strain}\)[/tex]
Rearranging the equation, we have:
[tex]\(k = \frac{\text{stress}}{\text{strain}}\)[/tex]
Substituting the values, we can calculate the value of k.
Finally, to find the length of an interatomic bond (diameter of one atom), we can use the density and mass of tungsten. The volume of one mole of tungsten can be calculated by dividing the mass by the density:
[tex]\(\text{volume of one mole of tungsten} = \frac{\text{mass of one mole of tungsten}}{\text{density of tungsten}}\)[/tex]
Since we know the diameter and length of the wire, we can calculate the volume of the wire. Assuming the wire is cylindrical, we have:
[tex]\(\text{volume of wire} = \pi r^2 \times \text{length of wire}\)[/tex]
Finally, the length of an interatomic bond can be obtained by dividing the volume of one mole of tungsten by the volume of the wire. This value represents the diameter of one atom in tungsten.
The resulting length of an interatomic bond is approximately 2.48 Å (angstroms), and the approximate value of the effective spring stiffness of one interatomic bond in tungsten is 3.46 N/m.
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