1.State Newton's Universal Law of Gravitation.
2.Define escape velocity and write its expression for Earth.
3.State Kepler's Three Laws of Planetary Motion.
4.What is a geostationary satellite? State its height and time period.
5.Calculate acceleration due to gravity at height $h = R$ above Earth's surface ($g = 9.8\text{ m/s}^2$).
6.At what depth below Earth's surface does value of $g$ reduce to half its value at surface?
7.Find orbital velocity of a satellite orbiting close to Earth's surface ($R = 6400 \text{ km}, g = 9.8 \text{ m/s}^2$).
8.Calculate gravitational potential energy of a $100 \text{ kg}$ mass at distance $2R$ from Earth's center.
