Answer:
ancient astronomy is back in the 1600s and is really old and modern astronomy is present and astronomy today
Time period and technology are the main differences between ancient and modern astronomy.
The main differences between ancient and modern astronomy is the era in which they were created and developed. The ancient astronomy developed by Greeks and technology for study is very old. The first documented records of systematic astronomical observations occurs in Assyro-Babylonians around 1000 BCE.
While on the other hand, modern astronomy refers to the astronomy that is developed in this modern period and use advance technology. Modern astronomy includes many elements of the motions as well as characteristics of moving bodies so we can conclude that time period and technology are the main differences between ancient and modern astronomy.
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A helicopter takes off from the ground and rises vertically. It then hovers at a constant height above the ground. Which sequence of energy changes takes place during the gain in height?
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.
What force is responsible for crushing or collapsing stars?
O nuclear fusion
O gravity
energy
O forces
Answer:
Explanation:
Gravity is the correct answer
What is hybridization plsssss help,i will give brainliest to de person who explains well
Answer: the process of an animal or plant breeding with an individual of another species or variety
Explanation:
there you go
Answer:
In chemistry, orbital hybridization (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., then the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory.
Explanation:
just copied it :|
A truck drives 80 km in 2 hours. The truck stops for 1 hr and continues driving for 100
km in 2.5 hrs. What was the truck's average speed for the entire trip? (round to the
neared 10th
Answer:
It Crashed Because it was speeding LOL
Explanation:
It was speeding so cops put spices and truck Crashed
A dog with mass 14 kg has a kinetic energy of 135.5 J. What is the speed
of the dog?
A. 2.3 m/s
B. 5.1 m/s
C. 3.2 m/s
D. 4.4 m/s
Answer: D. 4.4 m/s
Explanation:
Answer:The correct answer is 4.4 m/s but I will warn you, A p e x counted it WRONG when I gave this answer.
Explanation:
PLS ANSWER ASAP!! I PROMISE I'LL GIVE YOU BRAINLIEST!!
A water-skier is pulled behind a boat by a rope that is at an angle of 13° and has a tension of 490 N. The water-skier has a mass of 49 kg.
What are the magnitudes of the x- and y- components of the tension?
What is the normal force acting on the skier?
Answer:
normal force= 480.2 x component=477.4 y component= 110.4
Explanation:
I'm sorry I just did this today in class but i think normal force has to be equal to mg or the mass * gravity of the person and that would be 480.2 newtons. I multiplied 9.8 (gravity) by the mass of 49g
I think for the x and y components you can make a triangle with the angled string and then use sohcahtoa to solve for the tension. I used cos(13) = x/490 to solve for x component and then I used the pythagoran theroem to get the remaining side which would be : a^2 + 477.4^2 = 490^2
hope this can help and that it is correct. good luck
The magnitudes of the x- and y- components of the tension is 477.44N and 110.23N
The normal force acting on the skier is 480.2N
The magnitude of the x- and y- components of the tension is expressed as:
x = Tcos 13°y = T sin 13°Given the following
Tension T = 490N
x = 490 cos13° = 477.44N
y = 490sin13° = 110.23N
Hence the magnitudes of the x- and y- components of the tension is 477.44N and 110.23N
The normal force acting on the skier is equal to the weight.
N = W = mg
N = W = 49 * 9.8
N = W = 480.2N
Hence the normal force acting on the skier is 480.2N
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what is the answer?!
An object falls from the Transco Tower in Houston and takes 15 seconds to reach the ground. How tall is the building:
Answer: 1102.5 meters
Explanation:
In Newton’s second law, if the net force acting on object doubles. The object’s Will also double
Answer: Explanation:
If the net force on an object is doubled, its acceleration will double If the mass of an object is doubled, the acceleration will be halved .
In Newton’s second law, if the net force acting on object doubles then either acceleration is double or mass is double.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
According to Newtons second law force is product of mass and acceleration.
F = ma
In Newton’s second law, if the net force acting on object doubles then either acceleration is double or mass is double.
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Pls help
Tarnish is produced by a redox reaction that occurs when a metal reacts with a nonmetallic compound. The black tarnish on a silver dish might be produced by a reaction between silver and hydrogen sulfide. What occurs during this reaction?
A. Silver atoms lose electrons to sulfur atoms.
B. Silver atoms gain electrons from sulfur atoms.
C. A double-replacement reaction takes place
D. An acid-base reaction takes place.
Answer:
A. Silver atoms lose electrons to sulfur atoms
Explanation:
:p
Answer:
AA
Explanation:
What are the relationships between the different wave properties (frequency, wavelength, wave speed, period, amplitude)
Ex) As ___ increases, ___ increases/decreases/remains the same.
Answer:
As frequency (cycles per second) increases the wavelength decreases.
As frequency increases the period also decreases
If wave speed or velocity increases, so too does the frequency
Amplitude of a wave is totally independent of frequency, period etc. So it remains the same as frequency shifts. Like FM radio the amplitude remains the same as the frequency of the broadcast modulates.
Explanation:
F= 1/t Frequency is inversely proportional to time (wavelength)
Period is the time it takes for one wave cycle to complete Period is 1/f
++++++++++++++++++++++++++++++++++++
vw=λT Speed of propagation vw= wavelength x T time
vw=fλ Knowing frequency multiply times wavelength to get wave speed.
++++++++++++++++++++++++++++++++
Amplitude varies only as the energy applied varies. Like transmission power, in a 60 hz power feed the amplitude can be 120, 230, 460 volts (note these nominal amplitudes are RMS root mean squared or .707 of the peak of the waveform).
See link below, images are much easier to process, than plain text of course. Hope this helps.
Oops not allowed to post a link, it appears. so try the snippet of URL as attached.
Answer:
Im no expert buh its Wave length. :)
Explanation:
Im taking a test about it hope it helps.
QUICK QUESTION: What forces are acting upon a flying baseball when someone throws it?
Answer:
weight, drag, and lift
Explanation:
nasa
A book with a mass of 1.5 kg rests on the edge of a desk 0.75 m above the
floor. Given that the acceleration due to gravity is 9.8 m/s2, what is the book's
potential energy?
apex
Answer:
11.03 J
Explanation:
did it on a p e x
What is the net force required to accelerate a 5.3 kg box at a rate of 4.2 m/s^2?
Answer:
The answer is 22.26 NExplanation:
The force acting on an object given the mass and acceleration we use the formula
force = mass × accelerationFrom the question
mass = 5.3 kg
acceleration = 4.2 m/s²
We have
force = 5.3 × 4.2
We have the final answer as
22.26 NHope this helps you
A spacejet travels 800 miles/h .how long does it take to travel 1km
im talking about this qeastion
Answer:
a. Winter.
Explanation:
Answer:
Winter
Explanation:
For all my breakdancers out there can you please tell me how to do a second windmill I can get one but I’m stuck there
Answer:
Explanation: To breakdance, ask a friend or a professional, surf the internet, or invent your own moves. You don't have to master other breakdancers' moves to be a breakdancer yourself. You breakdancing by ...
Help with this review pls!!
Answer:
The 2 forces are a Push and a Pull
Mass is the resistance of change in speed or position when adding force.
Weight is the force of gravity
Tension Force is the pulling force transmitted through a string cable or chain. The formula for this is T = mg + ma.
It gives the particle the same acceleration as all those actual forces together as described by the Newton's second law of motion.
An unbalanced force is when there is 2 forces on opposites of an object both are adding force but one side is stronger than the other.
Friction is a force that heats things up. This happens when we rub our hands together and the heat that is generated from the friction makes our hands warmer.
Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction (also referred to as dynamic friction) is the force that resists the relative movement of the surfaces once they're in motion.
ice floats in water. which must be true. A. Ice molecules have more mass than water molecules. B. Ice molecules have less mass than water molecules. C. A volume of ice has less mass than the same volume of water. D. one gram of ice has less volume than 1 g of water.
Answer:
B
Explanation:
As we all know,mass is the amount of substance a body contains. So because Ice's mass is less than water, that's why it's able to float. In other words,we say ice is less dense than water
A volume of ice has less mass than the same volume of water. Hence, ice floats in water. Option (C) is correct.
What is density?The density of a material indicates the density of that material in a specific area. The density of a material is defined as its mass per unit volume. Density is a measurement of how closely matter is packed together. It is a distinct physical property of a specific object.
Archimedes, a Greek scientist, discovered the density principle. If you know the formula and understand the units, calculating density is simple. Density is represented by the symbol ρ, which can also be represented by the letter D.
Now, ice has less density compare to water. So, a certain volume of ice has less mass than the same volume of water. Hence, option(C) is correct.
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Which types of data should be modified to change the rate of rotation?
(1 point)
o the number of loops in the coil and the distance from the source of the current
o the number of loops in the coil and the electric current
the dimensions of coils and the distance from the source of the current
o the dimensions of the coils and the electric current
Answer:
the number of loops in the coil and the electric current.
Explanation:
Just took the test and got it correct.
If m=120kg and a=15m/s2, what is the force
Answer:
F= 1800N
Explanation:
the equation for force is F= ma
so plug in the numbers: F= (120)(15)
solve this to get F= 1800N
tip: don't forget to add the units when writing your answer :)
Two curves on a highway have the same radii. However, one is unbanked and the other is banked at an angle θ. A car can safely travel along the unbanked curve at a maximum speed v0 under conditions when the coefficient of static friction between the tires and the road is 0.563. The banked curve is frictionless, and the car can negotiate it at the same speed v0. Find the angle θ of the banked curve.
Answer:
θ = 29.38°
Explanation:
The centripetal force is given by the formula;
F_c = F_n(sin θ) = mv²/r
Now, the vertical component of the normal force is; F_n(cos θ)
Now, this vertical component is also expressed as; F_n(cos θ) = mg
Thus, the slope is;
F_n(sin θ)/F_n(cos θ) = (mv²/r)/mg
tan θ = v²/rg
v² = rg(tan θ)
The initial speed will be gotten from the relation;
(v_o)² = μ_s(gr)
Plugging rg(tan θ) for (v_o)², we have;
μ_s(gr) = rg(tan θ)
rg will cancel out to give;
μ_s = (tan θ)
Thus, θ = tan^(-1) μ_s
μ_s is coefficient of static friction given as 0.563
θ = tan^(-1) 0.563
θ = 29.38°
Why is carbon so important to living things on earth
Answer:
It helps planet earth to survive
Explanation:
Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent of our planet's air. A molecule of carbon dioxide (CO 2) is made up of one carbon atom and two oxygen atoms. Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere.
How many times larger is the mass of a proton compared to the mass of an electron?
Answer:
1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.
What voltage produces a current of 100 amps with a resistance of 50 ohms?
Answer:
To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)
Explanation:
good price
Answer:
what is it
Explanation:
A car traveling at 7 m/s accelerates at 2.5 m/s^2 to reach a speed of 12 m/s. How long does it take for this acceleration?
Answer:
1s
Explanation:
v=u+at
12=7+2.5t
t=12-7/5
t=1s
Why does the crane need a counterbalance?
Answer:
To make the lifting more efficient. It lets there be less taxing and saves a ton of energy!!
Explanation:
A woman who is a carrier for hemophilia marries a man who does not have the disease. If the couple has a daughter, what are the chances that their daughter would have hemophilia? (Hint: Use a Punnett square to determine the answer.)
A. 0 percent
B. 25 percent
C. 50 percent
D. 75 percent
Answer:
There is a 0% chance the daughter will have the disease (unless the husband is a carrier). There is a 50% chance she will be a carrier (assuming the husband is not a carrier).
Hope this helps :)
Explanation:
Where on the periodic table are the anions of ionic bonds found?
a . Anions are the negatively charged nonmetals on the right side of the periodic table
b. Anions are the negatively charged metals on the right side of the periodic table
c. Anions are the positively charged nonmetals on the left side of the periodic table
d. Anions are the positively charged metals on the left side of the periodic table
answer:
b.
explanation:
ik its right trust me <3
cause metals on the left and in the center of the periodic table form ionic bonds with nonmetals on the right of the periodic table.
Which is true about a surface wave? ANSWER FAST
A.It only has properties of transverse waves.
B.It only has properties of longitudinal waves.
C.It has properties of both transverse and longitudinal waves.
D.It does not have properties of either transverse or longitudinal waves.
Answer:
D
Explanation:
Answer:
The guy above me is wrong. The answer is actually...
(C.)