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1

Suppose the Sun's orbital speed were 440 km/s. What would be the Sun's orbital period?
2

Suppose the Sun's orbital speed were 440 km/s. What would be the mass required to keep the Sun in its orbit?
3

At the same distance from the center, the rotation speed of galaxy A is three times as large as the rotation speed of galaxy B. What can be said about the masses of the two galaxies?
4

The gas at a distance of 0.1 pc from the center of the galaxy has an orbital speed of 700 km/s. Use Equation 22.2 to find the mass of the material in the inner 0.1 pc of the galaxy.
5

Use the small angle equation to find the angular diameter of Sgr A* if it has a diameter of 13 AU and a distance of 8 kpc.





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