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# HW Ch13 - HW Ch 13 Gravity and Orbits Chapter 13 Gravity...

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HW Ch. 13 Gravity and Orbits Chapter 13: Gravity and Orbits Conceptual problems 13.C. 1 (5.00) Compare planets farther from the Sun to those nearer the Sun. (a) Do the farther planets have greater or lesser orbital speed than the nearer ones? (b) How does the angular speed of the farther planets compare to that of the nearer ones? (a) Outer planets have greater orbital speed.Outer planets have smaller orbital speed.The orbital speed is the same. (0/1 submissions used) (b) Outer planets have greater angular speed.Outer planets have smaller angular speed.The angular orbital speed is the same. (0/1 submissions used) 13.C. 6 (7.00) Match each of the following properties of a body in circular orbit to its dependence upon the radius of the orbit: (a) velocity, (b) kinetic energy, (c) period, and (d) angular momentum. (a) r −1 r −2 r 1/2 r −1/2 r 3/2 (0/2 submissions used) (b) r −1 r −2 r 1/2 r −1/2 r 3/2 (0/2 submissions used) (c) r −1 r −2 r 1/2 r −1/2 r 3/2 (0/2 submissions used) (d) r −1 r −2 r 1/2 r −1/2 r 3/2 (0/2 submissions used) Section 0: Introduction 13.0.1 (5.00) Use the simulation in the first interactive problem in Section 13.0 to answer the following questions. (a) Given two unchanging masses, does the force between two masses increase, decrease, or stay the same as the distance between the masses increases? (b) Given a fixed distance, does the force between two masses increase, decrease or stay the same as the masses increase?

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(a) Increase DecreaseStay the same (0/1 submissions used) (b) I ncreaseDecreaseStay the same (0/1 submissions used) Section 1: Newton’s law of gravitation 13.1.2 (5.00) A neutron star and a black hole are 5.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×10 30 kg and the black hole has a mass of 9.94×10 30 kg. What is the magnitude of the gravitational attraction between the two?
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