Question

A satellite of mass m completes one revolution around the earth at a constant speed s and radius r. Which of the following statements are false?

• The centripetal force is directed towards the center and is nonzero.
• The net force is directed inwards towards the earth.
• The satellite is accelerating.
• The magnitude of the work done by the earth on the satellite is nonzero.
• All of the above are true.

Answer 1

Option D is false because the work done by the earth on the satellite is zero .

The reason behind the zero work done is that the angle between the displacement and centripetal force is 90 degree.