A book with a mass of 1.2 kg sits on a bookshelf. If it has a gravitational
potential energy of 50 J, how high is the shelf? The acceleration of gravity is
9.8 m/s2
A. 1.2 m
B. 4.3 m
C. 5.9
D. 2.7 m

Answers

Answer 1

I'm sorry, I just saw this. I hope I'm not too late.

GPE = mass * gravity * height

height = GPE/(mass * gravity)

height = 50/(1/2 * 9.8)

height = 10.2041 Meters


Related Questions

The early experiments with static charges were done by:

Newton
Gilbert
Michelson
Galileo

Answers

Answer:

the answer is b .Gilbert

Explanation:

hope it helps !

When a current flows through a light bulb, it emits 30 J light energy in 2 seconds, What is the power of the bulb?

Answers

I believe the answer is P= 15w

The power of the light bulb is 15 watts.

What is power ?

Power in physics is defined as the rate of energy per unit time or in other words the work done by any electrical appliance per unit time. Power is expressed as -

P = E/T where E is Energy and T is the time period.

How to calculate the value of power in the question ?

Given that the light bulb emits 30 J light energy in 2 seconds.

We have E = 30J and T = 2 seconds.

Therefore power(P) = Energy(E) / Time(T)

∴  P = 30 / 2 = 15 watts

Thus the power of the light bulb is 15 watts.

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The structure of a main sequence star like our sun can hold for a long time because

A. Gravitation fore is counterbalanced by thermal expansion forces

B. The immense volume of matter

C. The rotational force

Answers

Answer: B

The immense volume of matter 

Explanation:

Stars are formed by cloud and dust, draw together by gravity.

But the longevity of a main sequence star lives depends on how massive it is. An enormous massive star burns faster due to its enormous material it contains and higher core temperatures caused by greater gravitational forces. While a less massive star will burn slowly and stick around the sun for a very long period. The structure of a main sequence star like our sun can therefore hold for a long time because of the immense volume of matter of star.

Somebody can tell me what answers it is?

Answers

Answer:

D

Explanation:

The color you see is the color the object reflectes. The rest of the color are absorbed by that object.

Isn’t it all colors are absorbed except red? OK I’M NOT THE BRIGHTEST SO

A steady increase in global temperature has been recorded between 1900 and today. Before concluding that this rise in temperature is the result of the increased burning of fossil fuels since that sametime, which of the following questions would have to be answered? *
A. What is the CO2 content in one metric ton of fossil fuels?

B. Which gases are released when burning fossil fuels?

C. What, if any, temperature rise was occurring prior to 1900?

D. None of these

Answers

Hey there!

The answer would be D. None of these

None of these questions can help support the reason that the temperature increase is based off of the burning fossil fuels.

Hope this helps!

Answer:

C is correct

Explanation:

Which electromagnetic radiation can be seen with the human eye?

ultraviolet rays and visible light

infrared rays, visible light, and ultraviolet rays

visible light

visible light and X-rays

Answers

Answer:

Visible light

Explanation:

Answer:

C visible light

Explanation:

Plz help! Will give brainiest!

For the girl to lift this rock, she must push her end down _____ to raise the rock _____.

A. a lot; a little
B. a little; a lot
C. a little; a little

Answers

Answer:

A is the correct answer

Explanation:

mark brainliest please

When a ball is tossed upward, along the way
A. the amount of kinetic energy and the amount of potential energy change
B. all of its energy is lost to friction with the air, and both kinetic and potential energy are zero at the highest point of travel.
C. its potential energy decreases and reaches zero at the highest point of travel D. its total energy increases and is at a maximum at the highest point of travel

Answers

Answer:

A

Explanation:

going upward, kinetic energy decrease and potential energy increase

Answer:

A

Explanation:

As a ball is thrown into the sky, potential energy increases and kinetic energy decreases. But, the mechanical energy ( that is the sum of the potential and kinetic energy) remains the same....

A TV draws 0.867 A of current when connected to a 122 V outlet. It’s resistance is 140.71.
A.)How many electrons pass through the TV per minute?
B.)How much electrical energy does the TV convert to other forms of energy
per minute?

Answers

Answer:

Explanation:

current measures charge flowing per second .

A current of .867 A means charge of .867 coulomb is flowing per second

charge flowing per minute = .867 x 60

= 52.02 coulomb

one electrons carries a charge of 1.6 x 10⁻¹⁹ Coulomb

So no of charge flowing per minute

= 52.02 / 1.6 x 10⁻¹⁹

= 32.5 x 10¹⁹ .

B )

electrical energy consumed per minute

= V X I X t , V is volt , I is current and t is time .

= 122 x .867 x 60

= 6346.44 J .

How long will it take for 64 g of a radioactive material to be reduced to 2.0 g if the half-life is 0.5 hours?

Answers

Answer:

2.5 hours is the answer according to me

Based on the law of conservation of energy hiw can we reasonably improve a machines ability to do work

Answers

We can reasonably improve a machines ability to do work by reducing the friction between the moving parts of machine.

is friction and pushing similar ????

Answers

Answer:

Yes, they are.

Explanation:

Answer:

No.

Explanation:

Pushing is the act of moving an object "forward" or towards the desired location.

Friction generally occurs when two surfaces (in this case, the ground and the object you are pushing) rub against each other. Gravity & the heaviness of the object will act as the counter to the force applied to push the object. Friction is the object trying to stay still, while pushing is trying to move the object.

~

Any two differences between SI units and derived units
help me...​

Answers

Answer:

SI unit

1) SI unit does not depend on other.

2) they have their own identity.

Derived unit

1) They depend upon other or fundamental unit.

2) they don't have their own identity.

(05.03 MC)

The color of four stars is shown in the table below.



Color of Stars
Star Color
W Yellow
X White
Y Blue
Z Orange
What is the correct order of the surface temperature of the stars, starting from the highest to the lowest?

Group of answer choices

Y, Z, W, X

X, W, Z, Y

Y, X, W, Z

Z, W, X, Y

Answers

Answer:

C is correct

Explanation:

The order of the surface temperature of the stars, starting from the highest to the lowest is Y > X > W > Z.

What is Wien's displacement law ?

Wien's displacement law states that, the black-body radiation curve for different temperatures will have different peaks of wavelengths and the wavelength is inversely proportional to the surface temperature.

Here,

According to Wien's displacement law,

The wavelength of the star is inversely proportional to its surface temperature.

λ [tex]\alpha[/tex] 1/T

where T is the surface temperature.

Therefore, the star with lowest wavelength will have the highest surface temperature.

Consider the wavelengths of each stars given,

The increasing order of their wavelengths can be written as,

λ(Orange) > λ(Yellow) > λ(White) > λ(Blue)

Therefore the increasing order of their surface temperatures will be,

T(Blue) > T(White) > T(Yellow) > T(Orange)

Hence,

The order of the surface temperature of the stars, starting from the highest to the lowest is Y > X > W > Z.

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A flowerpot that has a mass of 1.5 kg is sitting on a windowsill 30 meters from the ground. Is the energy of the flowerpot potential of kinetic?

How much energy does the flowerpot have?

Answers

Answer:

Potential energy

441 joules

Explanation:

The flower pot is not moving so it does not have kinetic energy. Anything that is still and a distance from the ground does have potential energy.

Amount of energy: p=mggh

p=1.5(9.8)(30)=441 joules

The flower pot's energy is measured in potential energy since it is remaining stationary and the energy is stored,  the flowerpot is not moving about so it is not kinetic energy.

The formula for potential energy is:

GPE = mgh

The m stands more mass, the g stands for gravitational energy (9.8m/s^2) and the h stands for height.

Our values for the following terms are:

M = 1.5kg

G = 9.8m/s^2

H = 30 meters

Now, we can plug it into our formula to solve for the amount of potential energy.

GPE = 1.5(9.8)(30)

First, let's multiply the gravitational energy and the height.

30 x 9.8 = 294

Then, multiply the mass by the result.

1.5 x 294 = 441

Therefore, the potential energy of the flowerpot is 441J.

3. If you increase the distance between
two objects, the gravitational force
between the two objects
A)increases
B)decreases

Answers

Answer:

B

Explanation:

A lever used to lift a 200 N object 3 meters off the ground, is doing how many Joules of work?

Answers

Answer:

6000J

Explanation:

T=m.g.h

T=200.(10).(3)

T=2000.(3)=6000J

Which two gases in the atmosphere are essential to life on Earth? *

Nitrogen and Helium
Oxygen and Carbon Dioxide
Neon and Argon
Hydrogen and Helium

Answers

Answer:

Explanation:

Oxygen and carbon dioxide

What is the velocity of a wave that has a frequency of 400 Hz and a wavelength of 0.5 meters?

Answers

Answer:

4.2

Explanation:

A flowerpot that has a mass of 1.5 kg is sitting on a windowsill 30 meters from the ground. Is the energy of the flowerpot potential of kinetic?

How much energy does the flowerpot have?

Answers

Answer:

It is Potential and corresponding to

90

J

.

Explanation:

Potential Energy is energy stored in the system and ready (potentially) to be changed into, say, Kinetic Energy through movement.

The general expression for Gravitational Potential Energy is:

U=mgh

where:

mg is the weight; h is the height relative to a certain reference level (the ground in this case) choosen to have zero Potential Energy.

With your data we get:

U=3⋅30=90J

What is the current when a 200Ω appliance is plugged in to the wall?

Answers

Answer:1.1 A

Explanation:

Given

Resistance of appliance [tex]R=200\ \Omega[/tex]

We know common house hold voltage in India is [tex]220\ V[/tex]

and according to ohm's law

[tex]V=IR[/tex]

So, current

[tex]I=\frac{220}{200}[/tex]

[tex]I=1.1\ A[/tex]

height of the image formed by a lens is-2cm.0what is the nature of the image?

Answers

Answer:

As the height is negative , image is inverted. This means it is inverted and real

Are you willing to do a project?

Answers

Answer:yes

Explanation: what project

how does force do positive work on an object?​

Answers

Answer:

It can do work on an object by moving it or changing it.

Explanation:

Brainliest?

Answer:

If you push on an object, thats positive work but if you pull on the object, thats negative work

Explanation:

At what point in a waterfall, do the drops of water contain the most gravitational potential energy?

Answers

Answer:

The water above receives energy as it falls down the short waterfall. This energy was stored as potential energy in the gravitational field of the Earth and came out of storage as the water dropped. This energy which came out of the gravitational field ended up being expressed as the kinetic energy of the water. That is, the water gains kinetic energy as it drops. An ounce of water is going faster when it hits the bottom of the waterfall than it was when it went over the top of the waterfall

Explanation:

The drops of water contain the most gravitational potential energy at the top before they start falling.

At the top of the waterfall

Gravitation

At the top of the waterfall, the water drops have the most gravitational potential energy before they start falling as the water at the peak of the waterfall is higher in the Earth's gravitational field and has gravitational potential energy. The potential energy is converted to kinetic energy when it falls. As a result, energy is not created; it was always there, stored as potential energy.

Potential energy is energy that is stored and is determined by the relative positions of various pieces of a system. Kinetic energy is the energy that an item or particle has as a result of its movement.

Find out more information about energy here:

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If several forces are exerted on a system, calculate the work done by each force, then multiply the results.
Question 4 options:
True
False

Answers

Answer:

false, each force might have a different about and a different direction

False because each force might have a different about and a different direction.

What is force?

A force in physics is an effect that has the power to alter an object's motion. 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.

The vector sum of all the forces equals the net force. In other words, the net force is the sum of all forces, it is obtained by combining all forces as vectors. The net force is the sum of the force vectors A + B + C for the situation of the three forces on the force board.

Work done due to force is given as,

Work done, W = F.S cosФ

Where F is force a vector quantity, S is displacement and Ф is angle between them.

When forces are exerted in different direction than net force is calculated using vector sum.

To learn more about force refer to the link:

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Dinesh wants to launch a package over the garden wall to his friend on the other side. His plan is to set up a see-saw, put the package on one end and jump on the other end. Dinesh determines that he will land on the board with a force of 1,127 newtons, and the package weighs 322 newtons. The board he is going to use for the see-saw is 9 meters long. How close to the end of the board should Dinesh put the fulcrum?

Answers

Answer:

Dinesh should put the fulcrum 2 m from himself and 7 m from the package.

Explanation:

Let the fulcrum be x meters from Dinesh's end.

The sum of clockwise moment must balance the sum of anti-clockwise moment.

Taking a moment about the fulcrum

(Force exerted by Dinesh) × (Distance of Dinesh from the fulcrum) = (Weight of the package) × (Distance of the package from the fulcrum)

Force exerted by Dinesh = 1127 N

Distance of Dinesh from the fulcrum = x m

Weight of the package = 322 N

Distance of the package from the fulcrum = (9 - x) m

1127 × x = 322 (9 - x)

1127x = 2,898 - 322x

1127x + 322x = 2,898

1449x = 2898

x = (2898/1449) = 2 m

Hence, Dinesh should put the fulcrum 2 m from himself and 7 m from the package.

Hope this Helps!!!

When an atom in a reactant loses electrons, what happens to its oxidation number?
A. Its oxidation number decreases
B. Its oxidation number doubles.
C.Its oxidation number increases.
D.Its oxidation number increases by one.
E. Its oxidation number stays the same.

Answers

It would be e because Reduction happens when an element gains electrons; in this case, its oxidation number is lowered. For example, when iron rusts, oxygen can behave as an oxidizing agent. As the oxygen gains electrons, it changes from an oxidation number of zero to an oxidation number of negative two.

ASAP PLEASE!!










When tectonic plates are strained to the point that they can no longer bend, which of the following is most likely to occur?

A. Earthquake

B. Volcanic Eruption

C. Convection Current

D. Ocean Basin Formation

Answers

The answer to you’re is A

How much net force is needed to accelerate a 3 kilogram skateboard at 5 m/s2 this last on is a exponent use this formula net force = mass x acceleration Will MARK BRAINLLIEST

Answers

Answer:

15 N

Explanation:

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