## College Physics (4th Edition)

The sun is moving at a speed of $199~km/s$ with respect to the center of the galaxy.
We can find the sun's linear speed as it orbits around the center of the galaxy: $v = \frac{d}{t}$ $v = \frac{2\pi~r}{t}$ $v = \frac{(2\pi)(2\times 10^{20}~m)}{(2.0\times 10^8)(365)(24)(3600~s)}$ $v = 199,000~m/s$ $v = 199~km/s$ The sun is moving at a speed of $199~km/s$ with respect to the center of the galaxy.