You can do each of the following without changing the laws of physic..... Shift

Question

You can do each of the following without changing the laws of physic..... Shift the origin of your coordinate system to be any position you like. Rotate the axes (plural of axis) of your coordinate system. Set your initial time (t=0) to be any time in the future or the past These each imply a certain physical quantity is conserved. What physical quantity's by I, II, & III. Respectively (in order). Energy Rotational Momentum Linear Momentum Linear Momentum Rotational Momentum Energy Linear Momentum Energy Rotational Momentum Energy Linear Momentum Rotational Momentum Rotational Momentum Energy Linear Momentum A spherical galaxy is rotating with a period T. Over a billion years, its radius decreases. What is the new period of the galaxy? The moment of inertia of a sphere is I=(2/5)M T/4 T/5 5T

Explanation / Answer

1 -(C)

2-(B)

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