# The radius of the earth's orbit

## The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days.

(a) What is the magnitude of the orbital velocity of the earth, in m/s2?

(b) What is the radial acceleration of the earth toward the sun, inm/s2?

(c) Repeat parts (a) and (b) for the motion of the planet Mercury (orbit radius = 5.79 X 107 km, orbital period = 88.0 days).

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