| 1. |
Two planets of radii R1 and R2 have the same density. The ratio of their accelerations due to gravity at the surface is |
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| 2. |
The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 9 R is |
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| 3. |
A reference frame attached to the Earth |
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| 4. |
 | The figure shows the elliptical orbit of a planet with the Sun at the focus. The areas of regions 1 and 2 are the same. If the planet takes times t1 to go from one end to the other end of region 1 and t2 to go from one end to the other end of region 2, then what is the relationship between t1 and t2? | |
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| 5. |
If the escape velocity of a rocket from the surface of the Earth is ve , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 4 times that of the Earth is |
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