Question

a satellite in circular orbit around the earth moves at constant speed. The orbit is maintained...

a satellite in circular orbit around the earth moves at constant speed.

The orbit is maintained by the force of gravity between the Earth and satellite, yet no work is done on the satellite. how is this possible?
A. no work is done if there is no contract between objects.
b.no work is done if done if the direction of motion is parallel to the force.
c. no work is done if the direction of motion is perpendicular to the force.
d. no work is done because there is no gravity in space.

2. what is the magnitude of the momentum of a 40-g bird flying with a speed of 6.5 m/?
a. 260 kg.m/s
b. 4 kg.m/s
c. 0.24 kg.m/s
d. 0.26 kg.m/s


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Answer #1

In this question we have to determine the workdone by gravitational force on a satelite moving in a circular orbit.

In 2nd part we have to find the magnitude of momentum of a bird.

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