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11.7 Exercise 20

Avg difficulty 2.5

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 1.5×10111.5 \times 10^{11} times that of the Sun (or 3×1041kg3 \times 10^{41} \text{kg}), located 30,000 ly away.

OpenStax University Physics Volume 3, 11.7 Evolution of the Early Universe, exercise 20

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Adapted from University Physics Volume 3 © 2016 Rice University. Licensed under CC BY 4.0. Source: University Physics Volume 3. Imported at revision db44eb9.