Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Gravitation, Exercise 2: Check Point 02

State Kepler’s first law of planetary motion.

What is the difference between perihelion and aphelion.

The distance of a planet from the sun is $40$ times that of the earth. What is the ratio of their time periods of revolution around the sun?

Suppose a planet exists whose mass and radius both are half that of the earth. The acceleration due to gravity on the surface of this planet will be double? Justify.

Acceleration due to gravity of the earth is less at the equator than at poles. Why?

A body drops down a tower and reaches the ground in $0.6 \mathrm{s}$. If $\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2$, then find the height of the tower.