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8:33 PM triton.physics.ndsu.nodak.edu Sprint , Main Menu Contents Grades Course Contents » » Homework 11 » Shrinking Timer Notes Evaluate Feedback Print Info The mass of a star is 1.67.1031 kg and its angular velocity is 1.50E-7 rad/s. Find its new anqular velocity if the diameter suddenly shrinks to 0.25 times its present size. Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5 mr Submission Submit Answer not arade Tries 0/!5 Tries Use more digits. My general Threaded View Chronological View Other Views preferenc what is marked as NEW Mark NEW posts no longer new Export NEW Cody Elhard Reply (Mon Nov 27 02:24:01 pm 2017 (CST) Is the mass uniform through both objects. Or are we supposed to account for the mass with the shrinkage of the diameter, since it says assume a uniform mass distribution.

Explanation / Answer

equating angular momentum before and after shrinkage

I1W1=I2W2

(2/5)mr1^2W1=(2/5)mr2^2W2

W2=r1^2W1/r2^2

r2=0.25r1

w2=w1/0.25^2

=2.40*10^(-7)rad/s.

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