Answer:
First the fuel in the engine gives chemical energy during burning. That chemical energy then converts to kinetic energy if the rotor of blades of the helicopter. Then kinetic energy converts in gravitational potential energy as it gains height.
A volleyball dug out by the opponent popped straight up into the air. It takes 2.05 seconds for the ball to reach its peak. Determine the height to which the ball flies. So far, I got the givens of t=2.05 seconds x=? a=9.8 meter per seconds squared final velocity=0 m/s they might be wrong though so help please!!!!
Answer:
The height to which the ball flies is 86.6 m.
Explanation:
Given that,
Time = 2.05 sec
Acceleration = 9.8 m/s²
We need to calculate the initial velocity of volleyball
Using equation of motion
[tex]v=u-at[/tex]
Where, u = initial velocity
a = acceleration
t = time
Put the value into the formula
[tex]0=u-9.8\times(2.05)^2[/tex]
[tex]u=41.2\ m/s[/tex]
We need to calculate the height of the the ball
Using equation of motion
[tex]v^2=u^2-2ah[/tex]
Put the value into the formula
[tex]0=(41.2)^2-2\times9.8\times h[/tex]
[tex]h=\dfrac{(41.2)^2}{2\times9.8}[/tex]
[tex]h=86.6\ m[/tex]
Hence, The height to which the ball flies is 86.6 m.
a car moving on a road passes by kilometer 218 at 10:15 am and milestone 236 at 10:30 am. determine an average scalar speed in km / h over this stretch.
Answer:
v?
Explanation:
v = ∆s / ∆t
v =?
∆s = 236 - 218 = 18km
=t = 10: 30 - 10:15 = 15 minutes to hour 15/60 = 0.25h
v = 18 / 0.25
v = 72km / h
speed of 72km / h
How is spring force different in a compressed spring versus a stretched spring?
Answer:
if you pull on a spring and stretch it, then you do work. that's bc you're applying a force over a displacement. your pull is the force and the amount that you stretch the spring is the displacement. a spring can be stretched or compressed.
Which best summarizes a concept related to the work-energy theorem?
When work is positive, the environment does work on an object.
When work is negative, the environment does work on an object.
O When work is positive, the kinetic energy in a system remains constant.
When work is negative, the kinetic energy in a system remains constant.
Answer: When work is positive, the environment does work on an object
Explanation:
The correct option is a)When work is positive, the environment does work on an object.
What is positive and negative work done ?
If work is done on the system , positive work is done on the system because energy enters the system in case of positive work done .If work is done by the system , work done will be negative
According to work energy theorem , change in kinetic energy is equal to work done . when energy enters in the system that means final energy is greater than the initial energy of the system , which implies positive work is done on an object .
this implies , correct option is a)When work is positive, the environment does work on an object.
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I need help with this problem
Ancient gold coins have been found in Greece and Italy. What property allows for gold to be stamped into coins?
Answer: malleability
Explanation:
1. Given a list of atomic model descriptions:
A: electron shells outside a central nucleus
B: hard, indivisible sphere
C: mostly empty space
Which list of atomic model descriptions represents
the order of historical development from the earliest
to most recent?
A) A, B, CBA, C, B
CB, C, A D) B, A, C
Answer: A: electron shells outside a central nucleus
B: hard, indivisible sphere
C: mostly empty space
Which list of atomic model descriptions represents
the order of historical development from the earliest
to most recent?
Explanation:
3
Atomic models have been proposed throughout history describing the possible arrangements of different particles inside the atoms.
The very first model for atom was given by Dalton known as the solid sphere model that was an indivisible hard sphere.The model given by Rutherford that was known as nuclear model mostly included empty space.The model given by Shrodinger showed electron shells as being outside the central nucleus.Thus, the correct order of atom model is B C A. Hence, the correct answer is option C.
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THIS ONE IS URGENT!!!
Examine the drawing of a molecule. Each ring represents an atom of nitrogen (N). What's the chemical formula of this
substance?
Answer:
The chemical formula for nitrogen gas is N2.
Explanation:
I just did this question and this was the correct answer!
Which scenario is an example of the transfer of thermal energy by
convection?
A. A person uses a hot iron to remove wrinkles from a shirt.
B. You warm your feet in front of a fireplace.
C. A cup heats up when you pour hot water into it.
D. Warm air in a hot air balloon rises and heats air at the top of the
balloon.
I think it would be, D. Warm air in a hot air balloon rises and heats air at the top of the balloon.
The scenario that represents an example of the transfer of thermal energy by convection is the warm air in a hot air balloon rises and heats air at the top of the balloon. Thus, the correct option for this question is D.
What is Convection?Convection may be defined as a type of process through which heat is significantly transferred by the movement of a heated fluid such as air or water. It involves the transfer of heat by the movement of a fluid (liquid or gas) between areas of different temperatures.
Thermal energy refers to the energy which is contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
This thermal energy gets transferred through the process of convection from the top of the balloon in an example of a hot air balloon. The concept of this works on the warm air that is filled in a balloon and this warm air rises and heats air at the top of the balloon.
Therefore, the correct option for this question is D.
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Where does the focal point of a convex mirror fall?
a. In front of the mirror.
b. Behind the curvature of the mirror.
C. At the vertex.
d. None of the above.
Rock X is released from rest at the top of a cliff is on earth. A short time later, Rock y is released from rest from the same point as rock X. Both rocks fall for several seconds before landing on the ground directly below the cliff. Frictional forces are considered to be negligible. Which of the following graph correctly shows the vertical velocity of rock X as a function of time? Take the positive direction to the upward.
Answer:
The graph that correctly shows the vertical velocity is B. since the velocity is negative and increases linearly over time
Explanation:
When an object is dropped from rest its movement is ruled only by the effect of gravity.
The acceleration of gravity [tex]g=9.8\ m/s^2[/tex] makes the object gain speed with a linear relation as shown:
vf = g.t
If we take the positive direction to be upward, then the speed will always be negative since the object will go against the positive direction.
Thus, the graph that correctly shows the vertical velocity is B. since the velocity is negative and increases linearly over time
From the given graphs, only the second graph (option B) started from rest (0) and later increased with time.
The given parameters;
Rock XRock yinitial velocity of Rock X = 0The final vertical velocity of the rock X after a short time "t" is calculated as follows;
[tex]v_y_f = v_y_i + gt\\\\v_y_f = 0 + 9.8t[/tex]
The vertical velocity of the rock x will increase with time as it moves downwards.
Therefore, we can conclude that, from the given graphs, only the second graph (option B) started from rest (0) and later increased with time.
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what is v^2=0.05-4.9 please i need this asap
Answer:
v =2.02
Explanation:
v^2=0.05-4.9
v^2=-4.85
square root both side
v=2.02
^^^^this is a not a perfect square
PLEASE HELP!
Which action is an example of a service provided by an organization that receives charitable donations?
A. researching vaccinations
B. advertising new medications
C. contracting to install waiting area carpeting
D. selling hospital supplies for a privately owned company
Answer:
A
Explanation:
Source: Trust me bro
Giving is a kind deed. Giving back to people in need allows you to grow personally and gives you a higher sense of fulfilment. It also makes you feel good to serve others. Thus, option A is correct.
What charitable donations in researching vaccinations?Donations to non-profit organizations are considered charitable contributions. Donations may take the form of cash, non-monetary goods, in-kind services, or volunteer time. According to IRS rules, the donation may be tax-deductible.
If you itemize your deductions, you may deduct gifts of money or other property provided to qualifying organizations for charitable purposes. In general, you can deduct up to 50% of your adjusted gross income, but in some circumstances, there are 20% and 30% limitations.
Therefore, A contribution is a gift given to a cause, humanitarian organization, or charity. A donation can come in many ways, such as cash, alms, services, or tangible objects like furniture, toys, food, or automobiles. A donation could meet a demand for transplantable organs or blood.
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Question 3 (0.4 points)
What happens to the motion and the distance between atoms in a gas such as air
when it is heated to a higher temperature?
The higher the temperature, the less the particles move, so they move slower
and spread apart.
O Motion and distance of atoms in gas are not related to temperature.
The higher the temperature, the more the particles move, so they move faster
and farther apart.
Please help quickly!
Answer:
As the temperature increases, the molecules and atoms move faster
Explanation:
We act out our forbidden fantasies in our dreams.
a. True
b. False
The magnitude of vector A is 10. Which of the following could be the components of A?
a) Ax= 5 , Ay= 5
b) Ax= 6 , Ay= 8
c) Ax= 7 , Ay= 9
d) Ax= 10 , Ay= 10
Answer: B. Ax = 6, Ay=8
Explanation:
When a chocolate bar is a solid does it have low thermal energy?
Answer:
Tiny particles in solids, liquids and gases are always in motion. It is the motion of particles that creates a form of energy called thermal (heat) energy that is present in all matter. The particles in solids are tightly packed and can only vibrate. Matter in its solid state has the lowest amount of thermal energy (for that type of matter). Because solids have less thermal energy than liquids or gasses, the atoms in their solid state move very little.
Explanation:
So yes, chocolate has VERY low thermal energy
1 pts
How can two different nonmetals form a compound?
Explanation:
Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules. Molecular compounds are electrically neutral. Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other.
Nonmetals can form compounds through a process called covalent bonding.
Covalent bonding occurs when two nonmetal atoms share electrons to achieve a stable electron configuration. This sharing of electrons allows both atoms to fill their outermost energy levels or achieve a noble gas electron configuration.
When two nonmetal atoms come together to form a compound, their electronegativities play a crucial role. Electronegativity is the ability of an atom to attract electrons toward itself in a chemical bond. If the electronegativities of the two nonmetals are similar, they will have a similar tendency to attract electrons, resulting in a more equal sharing of electrons.
So, nonmetals can form compounds through covalent bonding by sharing electrons. The extent of electron sharing depends on the electronegativity difference between the nonmetals involved, leading to either polar covalent or ionic bonding.
Therefore, nonmetals can form compounds through a process called covalent bonding.
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How is temperature related to the physical change of a substance?Which best describes why a liquid needs a container when a solid does not?
Answer:
C
i just took the test!
Answer:
Solids have definite shapes, and liquids fill their containers.
Explanation:
The ACTUAL answer
From the frame of reference of car 2, what is the velocity of car
what does the slope of the line represent on a velocity vs time graph
Answer:
The principle is that the slope of the line on a velocity-time graph reveals useful information about the acceleration of the object. If the acceleration is zero, then the slope is zero. If the acceleration is positive, then the slope is positive
Explanation:
What is the mass of 23 mL of a liquid that has a density of 1.5 g/mL?
Answer:
The answer is 34.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 23 mL
density = 1.5 g/mL
We have
mass = 23 × 1.5
We have the final answer as
34.5 gHope this helps you
When a ball is sitting still on top of a table, are the forces acting upon it balanced or unbalanced?
Answer:
Balanced
Explanation:
If a stationary object is staying still (in this case it's the ball) all of the forces acting upon it are balanced. If an object moving has balanced forces, it would move in the same direction at the same speed until a different outside force interrupts the equilibrium.
Hope this helps :)
This question involves the concepts of Newton's Second Law and Balanced Force.
The forces acting upon the ball are "Balanced".
Newton's Second LawAccording to Newton's Second Law whenever an unbalanced force is applied on an object, it produces an acceleration in the object in the direction of the force itself. This acceleration is directly proportional to the magnitude of the force and inversely proportional to the mass of the object.
Since, the ball is at rest and not moving. Hence, it has no acceleration and no unbalanced force is applied on it. The weight of the ball is balanced by the normal reaction provided by the table. Therefore, the forces acting on the ball are Balanced Forces.
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The two factors that determine velocity are....
A: speed and direction
B: direction and distance
C: position and rate
D: distance and mass
please help which one are these . for science class
Answer:
Explanation:
D Distance and Mass
A student stands on a spring scale. The scale reads that her weight is 600
Newtons. What is the student's approximate mass?
Answer:
61.2
Explanation:
F=g.m
<=> 600 = 9.8m
<=> m = 61.224489...
How does changing the force affect the sound?
Answer:
From a sound standpoint, higher tracking force reduces all other things being equal which might reduce the top end a bit and increase bass.
Igneous rock can be changed into which type of rock through the application of heat and pressure?
metamorphic rock
clastic sedimentary rock
non-foliated igneous rock
foliated igneous rock
Answer:
metamorphic rock
Explanation:
Igneous rocks can be changed into metamorphic rocks when heat and pressure are applied to the rock.
Pressure and heat in the presence of a fluid phase cause metamorphic transformation of a prolith.
At the right temperature and pressure, an igneous rock will not form magma but will undergo mineralogical changes to form metamorphic rocks. These changed rocks have different mineral facies that are different from those of the prolith.Through heat and pressure, igneous rocks can be transformed into metamorphic rocks.
Answer:
classic sedimentary rock
Explanation:
A ball is thrown up in the air for 1 second and has a displacement of 5 m.
Assume the ball is under the influence of gravity. a = -10 m/s. Determine the
initial velocity of the ball.
d=yt+at
Pete is driving down 7th street. He drives 550 meters in 8 seconds. Assuming he does not
speed up or slow down, what is his speed in meters per second
Answer:
Speed = 68.75m/s
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
[tex]S = \frac{d}{t}[/tex]
Given the following data;
Distance = 550m
Time = 8secs
Substituting into the above equation;
[tex]S = \frac{550}{8}[/tex]
Speed, S = 68.75m/s
is Babe Ruth?
And can you give me 3-5 sentences about her
1. Ruth first gained fame as a pitcher.
Although best remembered for swatting a prodigious 714 home runs and slugging .690, which remains a major-league record, Ruth was one of baseball’s most dominant left-handed pitchers in the 1910s. He won 89 games in six seasons with the Boston Red Sox, including 24 in 1917, and helped the team win three World Series titles. Ruth only pitched five games for the New York Yankees as his position switched to outfielder after being sold by Boston before the 1920 season.
2. He did not retire as a New York Yankee.
Ruth’s major-league career not only started in Boston, it ended there as well, but not with the Red Sox. Discarded by the Yankees as his performance waned, Ruth signed with the National League’s Boston Braves in 1935 in the hopes of becoming the team’s manager the following season. When it became clear that his skills had deteriorated and the promise would not be kept, Ruth ended his 22-year career after just 28 games in a Braves uniform.
3. Ruth was not a unanimous choice for the Baseball Hall of Fame.
A year after his retirement, Ruth was among the five initial inductees elected to the new National Baseball Hall of Fame under construction in Cooperstown, New York. In spite of Ruth’s amazing career statistics, 11 of the 226 voters left him off their ballots, and the “Sultan of Swat” trailed Ty Cobb as the leading vote-getter. Ruth’s plaque in Cooperstown refers to him as baseball’s “greatest drawing card,” and proving the point, the Hall of Fame last month opened a new exhibit on Ruth to coincide with the centennial of his first big-league season.
Explanation:
Answer:
He began his career as a pitcher: Ruth was both a left-handed pitcher and left-handed batter.
His father died in a fight with a family member
Ruth played for the Boston Red Sox (1914-1919), the New York Yankees (1920-1934) and briefly the Boston Braves (1935).
Explanation:
also babe ruth is a guy-