A 100 kg ball of lead rests next to a 10 kg rock. Which statement below is true?

Question

A 100 kg ball of lead rests next to a 10 kg rock. Which  statement below is true?     A.  The lead ball and the rock have equal amounts of inertia.    B.   If the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is less massive.   C.  On the moon both would have the same mass as on earth, but not the same weights as on earth.    D.  Because the lead ball has a larger mass than the rock, it will definitely have a larger volume than the rock.

Explanation / Answer

B) False; in a vacuum they would fall at the samerate. C) True; mass is a measure of the amount of"stuff"; weight is dependent on gravity. D) False; volume and mass are not comparable. Think of a piece of clay. If you take the same amountof clay and loosely mold it into a ball it will have the same massas a second tighter packed ball of the same clay but a differentvolume.
Hope this helps. Good luck!

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