Problem

Suppose you found a galaxy in which the outer stars have orbital velocities of 150 km/s....

Suppose you found a galaxy in which the outer stars have orbital velocities of 150 km/s. If the radius of the galaxy is 4.0 kpc, what is the orbital period of the outer stars? (Note: To two significant figures, 1 pc = 3.1 × 1013 km and 1 yr = 3.2 × 107 s.)

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Solutions For Problems in Chapter 16