An asteroid is discovered to have a tiny moon that orbits, Ask an Expert

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An asteroid is discovered to have a tiny moon that orbits it in a circular path at a distance of 117 km and with a period of 51.0 h. The asteroid is roughly spherical (unusual for such a small body) with a radius of 25.3 km.

a) Find the acceleration of gravity at the surface of the asteroid.

b) Find the escape velocity from the asteroid.

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