Question

What is the work done by the force of gravity in the following cases?

a) Satellite moving around the earth in a circular orbit of radius 35000km.

b)A stone of mass 250 g thrown up to a height of 2.5 m.

plz tell answer of both parts ​

Answer 1

Answer:

1. case of satellite: work done will be 0, as the displacement here is occuring in perpendicular direction to the force applied ie gravity.

2. case 2:here also as the stone comes back tpo the earth, the displacement is 0. so the net work done by gravitational force will be 0. in moving the stone up the workdone will be exactly the same and opposite while  the stoneis coming  down.

Explanation:

Answer 2

Explanation:

Gravity acts towards the center of the earth. So if the satellite moves in a circular orbit with center of earth as the orbit center the work done at any point is zero, since the force and the displacement are perpendicular.

b- the work of force of gravity is to pull the stone towards the center of the earth downwards [universal law of gravitation