The earth completes a circular around the sun in one year. The orbit has a radius of 93000000miles. What is the speed of the earth around the sun in m/s?
1 mile = 1609 meters or 1.61*10^3 m/mi
1 year = 31,557,600seconds or 3.16*10^7 s/yr
speed = 2 pi R / time
= 2 pi * 9.3*10^7 miles/1 yr * 1 yr/3.16*10^7s * 1.61*10^3 mi/m
= 29.8 * 10^ 3 = 29,800 meterss/second