Planet Sec is spherical and has uniform density. Its radius is R = 5.00 x 106 m

Question

Planet Sec is spherical and has uniform density. Its radius is R = 5.00 x 106 m and its mass is M=4.00x10 kg
a) A football is in a circular orbit around planet Sec. The speed of the football in the orbit is 400 m/s. What is the radius of the orbit of the football, measured from the center of the planet?

b) A rock is released from rest from a height of 20.0 m above the surface of the planet. How many seconds does it take the rock to reach the surface of the planet? Air resistance can be neglected.

Explanation / Answer

a)1.67*10^(7) m b)19.4 s

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