34.1 Exercise 20

Assuming a circular orbit for the Sun about the center of the Milky Way galaxy, calculate its orbital speed using the following information: The mass of the galaxy is equivalent to a single mass $1 . 5 \times \text{10}^{\text{11}}$ times that of the Sun (or $3 \times \text{10}^{\text{41}} \text{kg}$), located 30,000 ly away.