A star has a mass of 1.5 x 10^30 kg and is moving in a circular orbit about the center of its galaxy. The radius of the orbit is 2.2 x 10 ^ 4 light years( 1 lightyear = 9.5 x 10 ^15 m ) , and the angular speed of the star is 2.2 x 10 ^ -15 rad/s. a) Determine the tangential speed of the star. b) What is the magnitude of the net force that acts on the star to keep moving around the center of the galaxy?

University Physics Volume 1
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Author:William Moebs, Samuel J. Ling, Jeff Sanny
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Chapter13: Gravitation
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Problem 42P: Astronomical observatrions of our Milky Way galaxy indicate that it has a mass of about 8.01011...
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A star has a mass of 1.5 x 10^30 kg and is moving in a circular orbit about the center of its galaxy. The radius of the orbit is 2.2 x 10 ^ 4 light years( 1 lightyear = 9.5 x 10 ^15 m ) , and the angular speed of the star is 2.2 x 10 ^ -15 rad/s. a) Determine the tangential speed of the star. b) What is the magnitude of the net force that acts on the star to keep moving around the center of the galaxy?
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