## College Physics (4th Edition)

The average linear speed of the earth about the sun is $30~km/s$
Let the orbital radius be $1.5\times 10^{11}~m$ We can find the average linear speed of the earth about the sun: $v = \frac{d}{t}$ $v = \frac{2\pi~r}{t}$ $v = \frac{(2\pi)(1.5\times 10^{11}~m)}{(365)(24)(3600~s)}$ $v = 30,000~m/s = 30~km/s$ The average linear speed of the earth about the sun is $30~km/s$