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Shreyoshi Sen asked a question
Subject: Physics, asked on on 17/11/12
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Subject: Physics, asked on on 3/12/14
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Subject: Physics, asked on on 26/4/14

1. State Newton's law of gravitation. Hence define universal gravitational constant. Give thevalue and dimensions of G.

2. Define acceleration due to gravity. Show that the value of 'g' decreases with altitude or height.

3. Discuss the variation of ‘g' with depth. What happens to 'g' at the centre of earth?

4. Write down the formula of gravitational potential energy and obtain from it an expression for
gravitational potential
.

5. What do you mean by gravitational potential energy of a body? Obtain an expression for it for
a body of mass m lying at distance r from the centre of the earth
.

6. Define the term orbital speed. Establish a relation for orbital speed of a satellite orbiting very
close to the surface of the earth. Find the ratio of this orbital speed and escape speed.

7. What are geostationary satellites? Calculate the height of the orbit above the surface of the
earth in which a satellite, if placed, will appear stationary.

8. State Kepler's law of planetary motion.

9. What is a polar satellite? Explain how does it scan the entire earth in its each revolution? Give
two important uses of a polar. Satellite.

10. What do you mean by the term weightlessness? Explain the state of weightlessness of (i) a freely falling body (ii) an astronaut in a satellite orbiting the earth.

11. Obtain an expression for the acceleration due to gravity on the surface of the earth in terms of mass of the earth and its radius. Discuss the variation of acceleration due to gravity with
altitude and depth.

12. State the conditions necessary for a satellite to appear stationary.

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Subject: Physics, asked on on 15/10/14
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Subject: Physics, asked on on 13/10/12
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Subject: Physics, asked on on 19/11/16
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