1. 
If the radius of the Earth were increased by a factor of 3 and its mass remained the same, then the acceleration due to gravity on the Earth would 




2. 
A satellite orbits at a height h above the Earth's surface. Let R be the Earth's radius. If V_{e} is the escape velocity and V_{o} is the orbital velocity of the satellite orbiting at a height h << R, then 




3. 
If a simple pendulum with a time period of 4 seconds is made to oscillate at a height R equal to the Earth's radius, then its time period at this height will be 




4. 
An Earth satellite of mass m revolves at a height h from the surface of the Earth. If R is the Earth's radius and g is the acceleration due to gravity at the surface of the Earth, then the velocity of the satellite is given by 




5. 
A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is 



