In order to find time, the astronaut orb...

In order to find time, the astronaut orbiting in an earth satellite should use

a pendulum clock.

watch having main spring to keep it going

either a pendulum clock or a watch

neither a pendulum clock nor a watch.

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TARGET PUBLICATION-Gravitation-Exercise

Suppose the universal gravitational constant starts to decrease, then
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A spherically symmetric gravitational system of particles has a mass d...
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