21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 17, Problem 45QP
To determine
The size of a neutron star that has the mass of the Sun.
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What is the average density of a neutron star that has the same mass as the sun but a radius of only 86.31 km? Express your answer in the proper SI unit and without scientific notation.
Under some circumstances, a star can collapse into an extremely dense object made
mostly of neutrons and called a neutron star. The density of a neutron star is roughly 10¹4
times as great as that of ordinary solid matter. Suppose we represent the star as a uniform,
solid, rigid sphere, both before and after the collapse. The star's initial radius was 7.0×105
km (comparable to our sun); its final radius is 18 km.
what is the mass of the black hole ? give your answer as a multiple of Ms where Ms is the solar mass, Ms = 2.0 * 10^(30)
express your answer as a multiple of the solar mass mass Ms.
Chapter 17 Solutions
21st Century Astronomy
Ch. 17.1 - Prob. 17.1CYUCh. 17.2 - Prob. 17.2CYUCh. 17.3 - Prob. 17.3CYUCh. 17.4 - Prob. 17.4CYUCh. 17 - Prob. 1QPCh. 17 - Prob. 2QPCh. 17 - Prob. 3QPCh. 17 - Prob. 4QPCh. 17 - Prob. 5QPCh. 17 - Prob. 6QP
Ch. 17 - Prob. 7QPCh. 17 - Prob. 8QPCh. 17 - Prob. 9QPCh. 17 - Prob. 10QPCh. 17 - Prob. 11QPCh. 17 - Prob. 12QPCh. 17 - Prob. 13QPCh. 17 - Prob. 14QPCh. 17 - Prob. 15QPCh. 17 - Prob. 16QPCh. 17 - Prob. 17QPCh. 17 - Prob. 18QPCh. 17 - Prob. 19QPCh. 17 - Prob. 20QPCh. 17 - Prob. 21QPCh. 17 - Prob. 22QPCh. 17 - Prob. 23QPCh. 17 - Prob. 24QPCh. 17 - Prob. 25QPCh. 17 - Prob. 26QPCh. 17 - Prob. 27QPCh. 17 - Prob. 28QPCh. 17 - Prob. 29QPCh. 17 - Prob. 30QPCh. 17 - Prob. 31QPCh. 17 - Prob. 32QPCh. 17 - Prob. 33QPCh. 17 - Prob. 34QPCh. 17 - Prob. 35QPCh. 17 - Prob. 36QPCh. 17 - Prob. 37QPCh. 17 - Prob. 38QPCh. 17 - Prob. 39QPCh. 17 - Prob. 40QPCh. 17 - Prob. 41QPCh. 17 - Prob. 42QPCh. 17 - Prob. 43QPCh. 17 - Prob. 44QPCh. 17 - Prob. 45QP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardAstrophysical theory suggests that a burned-out star whose mass is at least three solar masses will collapse under its own gravity to form a black hole. If it does, what is the radius of its event horizon?arrow_forwardHow massive would a black hole have to be to have an event horizon the same size as the Earth? Assume the Earth's radius is 6,300 km. Answer in solar masses.arrow_forward
- If the radius of the neutron star is 85.074 km, what is the average density of a neutron star that has the same mass as the sun but a radius of only 20.0 km? (express your answer in the proper SI unit and without scientific notation)arrow_forwardWhat is the average density of a neutron star that has the same mass as the sun but a radius of only 20.0 km if the radius of the neutron star is 57.999 km?arrow_forwardWhat is the average density of a neutron star that has the same mass as the sun if the radius of the neutron star is 41.591 km?(express the answer in the proper SI unit and without scientific notation)arrow_forward
- Given the mass of the sun (1.989 x 10^30 kg), calculate the average density of a neutron star with a radius of 37.779 km.arrow_forwardBlack holes with masses smaller than those formed in supernovas may have been created in the Big Bang.Calculate the radius of one that has a mass equal to the Earth’s.arrow_forwardAstronomers discover a binary system with a period of 90 days. Both stars have a mass twice that of the Sun. How far apart are the two stars? Both stars revolve around the center of mass in an orbit with radius r. F2oni d=ar Fron2 The distance between the stars is 2r.arrow_forward
- What is the average density of a neutron star that has the same mass as the sun but a radius of only 20.0 km?arrow_forwardThe Sun’s lifetime is about 10 billion years. Estimate the lifetime of a star with twice the mass of the Sun.arrow_forwardIf the radius of the Sun is 7 x 108 m, how does the black hole’s radius compare? (Divide the radius of the Sun by the Schwarzschild radius). Your answer should be in the form of “The Sun is _____ times smaller/bigger than the black hole.” Rsun=7x108 m Rs=29.64kmarrow_forward
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