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Gravitation - Physics Questions asked by Filo students

Views: 5,414

A 400 kg satellite is in a circular orbit of radius

2 R_{E}

about the Earth. How much energy is required to transfer it to a circular orbit of radius

4 R_{E}

? What are the changes in the kinetic and potential energies ?

Topic:

Gravitation

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Views: 5,040

(a) a person weighs 60 kg on earth. Will his weight increase as he moves to the top of a hill ?
(b) will the weight of person increase at the bottom of a mine ?

Topic:

Gravitation

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Views: 5,872

Acceleration due to gravity is independent of mass of the earth/mass of the body.

Topic:

Gravitation

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Views: 5,994

A and B are two satellite revolving round the earth in circular orbits have time orbits have time period 8hr and 1hr respectively. The ratio of their radius of orbits a.

8^{3 / 2} : 1

8 : 1

4 : 1

2 : 1

Topic:

Gravitation

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Views: 5,185

(a) Assuming the earth to be a sphere of uniform density, calculate the value of acceleration due to gravity at a point (i)

1600 k m

above the earth, (ii)

1600 k m

below the earth, (b) Also find the rate of variation of acceleration due to gravity above and below the earth's surface. Radius of earth

= 6400 k m, g 9.8 m / s^{2}

Topic:

Gravitation

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Views: 5,847

(a) At what rate should the earth so that the apparent

g

at the equator becomes zero? What will be the length of the day in this situation?
(b) A body stretches a spring by a particular length at the earth's surface at equator. At what height above the south pole will it stertch the same spring by the same length? Assume the earth to be spherical.

Topic:

Gravitation

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Views: 5,187

A ball A of mass m falls on the surface of the earth from infinity. Another ball B of mass 2m falls on the earth from the height equal to six times the radius of the earth. Then ratio of velocities of A and B on reaching the earth is

x / y

where x and y are coprimes. Find x+y .

Topic:

Gravitation

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Views: 5,532

A ball falls of a table and reaches the ground in 10 s. Assuming

g = 10 m / s^{2}

, calculate its speed on reaching the ground and the height of the table.

Topic:

Gravitation

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Views: 5,144

A ball falls off a table and reaches the ground in 1 s. Assuming g =

10 m / s^{2}

, calculate its speed on reaching the ground (2 marks) and the height of the table.

Topic:

Gravitation

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Question 10

Views: 5,289

A ball falls off a table and reaches the ground in 1 s. Assuming

g = 10 m / s^{2}

, calculate its speed on reaching the ground and the height of the table.

Topic:

Gravitation

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Question 11

Views: 5,533

A ball is dropped from a cliff. Find its speed when it has fallen through 78.4 m.

Topic:

Gravitation

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Question 12

Views: 5,263

A ball is dropped from a height. If it takes 0.2s to cross the last 6m before hitting the ground, find the height from which it is dropped. Take

g = 10 \frac{m}{/} s^{2} (A S_{1})

Topic:

Gravitation

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Question 13

Views: 5,369

A ball is dropped from a height. If it takes 0.2s to cross the last 6m before hitting the ground, find the height from which it is dropped. Take

g = 10 \frac{m}{/} s^{2} (A S_{1})

Topic:

Gravitation

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Question 14

Views: 5,864

A ball is dropped from a height. If it takes 0.2s to cross the last 6m before hitting the ground, find the height from which it is dropped. Take

g = 10 m/s^{2}

A S_{1}

Topic:

Gravitation

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Question 15

Views: 5,159

A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball ?a. it will fall down to the earth gradually b. it will go very far in the space c. it will continue to move with the same speed along the original orbit of spacecraft d. it will move with the same speed, tangentially to the spacecraft.

Topic:

Gravitation

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Question 16

Views: 5,427

A ball is dropped from a spacecraft revolving around the earth at a height of

1200 k m

. What will happen to the ball ? .a. continue to move with same speed along a straight line tangentially to the satellite at that time b. continue to move with the same speed along the original orbit of satellite c. fall down to the earth gradually d. go far away in space

Topic:

Gravitation

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Question 17

Views: 5,560

A ball is projected vertically up with a speed of 50 m/s. Find the maximum height , the time to reach the maximum height, and the speed at the maximum height

(g = 10 m / s^{2}) (A S_{1})

Topic:

Gravitation

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Question 18

Views: 5,908

A ball is projected vertically up with a speed of 50 m/s. Find the maximum height , the time to reach the maximum height, and the speed at the maximum height

(g = 10 m / s^{2}) (A S_{1})

Topic:

Gravitation

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Question 19

Views: 5,662

A ball is projected vertically up with a speed of 50 m/s. Find the maximum height , the time to reach the maximum height, and the speed at the maximum height (

g = 10 m/s^{2}

A S_{1}

Topic:

Gravitation

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Question 20

Views: 5,578

A ball is thrown vertically upwards with a velocity of 49 ms -- Calculate fi) the maximum height to which it rises, (ii) the total time it takes to return to the surface of the earth.

Topic:

Gravitation

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