Physics: Principles with Applications
Physics: Principles with Applications
6th Edition
ISBN: 9780130606204
Author: Douglas C. Giancoli
Publisher: Prentice Hall
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Chapter 5, Problem 88GP
To determine

To find: The mass of galaxy and number of stars in it.

Expert Solution & Answer
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Answer to Problem 88GP

  3.45×1041 kg and 1725×108

Explanation of Solution

Given:

  r=30,000light years=30,000×9.5×1015m

  T=2×106 years

Formula Used:

The Gravitational Attraction provides the centripetal acceleration.

  GMGalavyMSR2=MSV2RMG=V2RG

But V=2πR/T

Therefore, MG=4π2R3T2G

Calculation:

Substituting the values

  M=4π2(30000×9.5×1015)36.67×1011×(6.3×1015)2

  M=3.45×1041 kg

and number of stars are

  N=3.45×10412×1030=1725×108

Conclusion:

Therefore the mass of galaxy is 3.45×1041 kg and number of stars are 1725×108 .

Chapter 5 Solutions

Physics: Principles with Applications

Ch. 5 - 10. A car maintains a constant speed v as it...Ch. 5 - Prob. 12QCh. 5 - Prob. 13QCh. 5 - Does an apple exert a gravitational force on the...Ch. 5 - Prob. 15QCh. 5 - Prob. 16QCh. 5 - Prob. 17QCh. 5 - Prob. 18QCh. 5 - Prob. 19QCh. 5 - Prob. 20QCh. 5 - Prob. 21QCh. 5 - Prob. 22QCh. 5 - Prob. 23QCh. 5 - Prob. 24QCh. 5 - A child sitting 1.20 m from the center of a...Ch. 5 - A jet plane traveling 1890 km/h (525 m/s) pulls...Ch. 5 - Prob. 3PCh. 5 - What is the magnitude of the acceleration of a...Ch. 5 - 5. (II) A 0.55-kg ball, attached to the end of a...Ch. 5 - How fast (in rpm) must a centrifuge rotate if a...Ch. 5 - Prob. 7PCh. 5 - How large must the coefficient of static friction...Ch. 5 - Prob. 9PCh. 5 - Prob. 10PCh. 5 - How many revolutions per minute would a...Ch. 5 - Prob. 12PCh. 5 - Prob. 13PCh. 5 - Prob. 14PCh. 5 - Prob. 15PCh. 5 - Prob. 16PCh. 5 - Prob. 17PCh. 5 - Prob. 18PCh. 5 - Prob. 19PCh. 5 - Prob. 20PCh. 5 - Prob. 21PCh. 5 - Prob. 22PCh. 5 - Prob. 23PCh. 5 - Determine the tangential and centripetal...Ch. 5 - Prob. 25PCh. 5 - For each of the cases described below, sketch and...Ch. 5 - Prob. 27PCh. 5 - Calculate the force of Earth's gravity on a...Ch. 5 - At the surface of a certain planet, the...Ch. 5 - At what distance from the Earth will a spacecraft...Ch. 5 - Prob. 31PCh. 5 - Prob. 32PCh. 5 - Prob. 33PCh. 5 - Prob. 34PCh. 5 - Prob. 35PCh. 5 - Prob. 36PCh. 5 - Prob. 37PCh. 5 - Prob. 38PCh. 5 - Prob. 39PCh. 5 - Prob. 40PCh. 5 - 41. (II) Every few hundred years most of the...Ch. 5 - 42 (II) Four 7.5-kg spheres are located at the...Ch. 5 - 43. (II) Determine the distance from the Earth's...Ch. 5 - 44.(II) A certain neutron star has five times the...Ch. 5 - 45. (I) A space shuttle releases a satellite into...Ch. 5 - Prob. 46PCh. 5 - Prob. 47PCh. 5 - Calculate the period of a satellite orbiting the...Ch. 5 - Prob. 49PCh. 5 - What will a spring scale read for the weight of a...Ch. 5 - Prob. 51PCh. 5 - Prob. 52PCh. 5 - A Ferris wheel 22.0 m in diameter rotates once...Ch. 5 - At what rate must a cylindrical spaceship rotate...Ch. 5 - (a) Show that if a satellite orbits very near the...Ch. 5 - Neptune is an average distance of 4.5 x 109 km...Ch. 5 - The asteroid Icarus, though only a few hundred...Ch. 5 - Prob. 58PCh. 5 - Determine the mass of the Earth from the known...Ch. 5 - Prob. 60PCh. 5 - Prob. 61PCh. 5 - Prob. 62PCh. 5 - Prob. 63PCh. 5 - Prob. 64PCh. 5 - Prob. 65PCh. 5 - Prob. 66GPCh. 5 - Prob. 67GPCh. 5 - Prob. 68GPCh. 5 - Prob. 69GPCh. 5 - Prob. 70GPCh. 5 - Prob. 71GPCh. 5 - Prob. 72GPCh. 5 - Prob. 73GPCh. 5 - Prob. 74GPCh. 5 - Prob. 75GPCh. 5 - Prob. 76GPCh. 5 - Prob. 77GPCh. 5 - Prob. 78GPCh. 5 - Prob. 79GPCh. 5 - Prob. 80GPCh. 5 - Prob. 81GPCh. 5 - Prob. 82GPCh. 5 - Prob. 83GPCh. 5 - Prob. 84GPCh. 5 - Prob. 85GPCh. 5 - Prob. 86GPCh. 5 - Prob. 87GPCh. 5 - Prob. 88GPCh. 5 - Prob. 89GPCh. 5 - Prob. 90GPCh. 5 - Prob. 91GPCh. 5 - Prob. 92GPCh. 5 - Prob. 93GPCh. 5 - Prob. 94GP
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