Discussion
An artificial satellite revolves round the earth in a circular orbit. Which quantity remains constant?
Answer: A
Angular momentum remains constant.
Gravity acts along the line joining the satellite to the earth's centre, so it exerts no torque about that centre and \(\vec{L} = \vec{r}\times\vec{p}\) is conserved. In a circular orbit the speed is constant too, but the linear velocity is not, since its direction changes continuously.
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