# CLASS 11 PHYSICS

Q1- If M= mass of the earth,R = radius of the earth,then wwhat is the gravitational potential at the centre of the sphere?Aslo define what is gravitational potential?

Q2- two sarellites are in the parking orbits around the earth.Mass of one of is 1 times other.What is the ratio of their time periods of revolutions?

Q3- The coefficient of friction of an inclines plane is 1/root3. if it is inclined at 30 angle with the horizontal, then what will be the downward acceleration of the block placed on the inclined plane?

A1 – Gravitational potential energy is energy an object possesses because of its position in a gravitational field. The gravitational potential at the centre of the sphere is U = -(G.M.m)/R

A2 – Parking orbits are the orbit of geostationary satellites. Hence, the ratio of their periods of revolutions will be 1:1.