Answered: Gravitational constant

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter13: Gravitation

Section: Chapter Questions

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 near the visible edge of a galaxy travels in a uniform circular orbit. It is 48,300 ly (light-years) from the galactic center and has a speed of 275 km/s.

Estimate the total mass of the galaxy based on the motion of the star. Gravitational constant is 6.674×10⁻¹¹ m³/(kg·s²) and mass of the Sun M_s=1.99 × 10³⁰ kg.

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