Question

(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.)

(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