Question

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,

Options

• the total mechanical energy of S varies periodically with time.

• the linear momentum of S remains constant in magnitude.

• the acceleration of S is always directed towards the centre of the earth.

• the angular momentum ofS about the centre of the earth changes in direction, but its magnitude remains constant.

Answer 1

the acceleration of S is always directed towards the centre of the earth.

Explanation:

The gravitational pull on the satellite will be aimed at the earth's centre, hence the satellite's acceleration will also be aimed at the earth's centre.