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(D) The orbital radius $r$ of a satellite is determined by the balance of gravitational force and centripetal force: $\frac{GMm}{r^2} = \frac{mv^2}{r}

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Angular momentum

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(D) The orbital radius $r$ of a satellite is determined by the balance of gravitational force and centripetal force: $\frac{GMm}{r^2} = \frac{mv^2}{r}$.For a circular orbit,the angular momentum $L = mvr$ is conserved if no external torque acts on the system.Since the gravitational force is a central force,it exerts no torque on the satellite.Therefore,the angular momentum $L$ of the satellite remains unchanged even if the gravitational constant $G$ changes over time.

If the gravitational constant $G$ is decreasing with time,what will remain unchanged for a satellite orbiting around the Earth?

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