(1) What is the linear speed of the earth in its orbit about the sun? Give your answer in meters per second. (Consider the earth's orbit to be a circle of radius 1.50×1011 m.)

Question

(2) What is the linear speed of Jupiter in its orbit about the sun? Give your answer in meters per second. (Consider the orbit of Jupiter to be a circle of radius 7.78×1011 m and that it takes 11.90 yr for one orbit around the sun.)

Answer 1

C = 2pi * r meters
length of a year is t = 3.16*10^7 seconds

just divide C/t

Answer 2

Speed = 2*pi*r/t
= 2*3.142*1.50E11/3.16E7
= 29,829m/s