Secure https://session mastering physics.com/myct/it assignmentProblemID 7395470

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Secure https://session mastering physics.com/myct/it assignmentProblemID 73954703 Spring terview? 2017 Phys201 Week 9 (graded) Problem 10.65 Problem 10.65 Part A 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 lfthe original star rotated once in 35 days, find the angular speed ofthe neutron star. Express your answer using two significant figures. 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 stars initial radius was 8.0x105 km (comparable to our sun), its final radius is 15 km 1104 rad/s Submit Answers Incorrect: Try Again; 3 attempts remaining

Explanation / Answer

Conserve angular momentum: initial I = final I
For a solid sphere, I = (2/5)mr²
initial = 2 rads / T = 2 / (35days * 24hr/day * 3600s/hr) = 2.077e-6 rad/s
(2/5)*m*(8e5 km)² * 2.077e-6rad/s = (2/5)*m*(15 km)² *
(2/5)m cancels;
= 5907.911 rad/s

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