1. 
If a simple pendulum with a time period of 5 seconds is made to oscillate at a height R equal to the Earth's radius, then its time period at this height will be 




2. 
The ratio of the time periods for two satellites of equal mass in circular orbits of radii R and 4 R is 




3. 
If the value of gravitational acceleration at a height h above the Earth's surface is the same as that at a depth d below the Earth's surface (with both h and d small compared to the Earth's radius R), then 




4. 
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 




5. 
If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will 



