Quiz08_13solutions

Quiz08_13solutions - Physics 221 Quiz 8 Spring 2013 Name...

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Physics’221 ’ Quiz’8 ’ Spring’2013 ’ Name’’ Section___________’ Quiz’8A ’ 1. A’12.0 -g’wad’of’sticky’clay’is’hurled’horizontally’at’ a’ 100-g’wooden’block’ initially’at’rest’on’ a’ horizontal’surface.’The’clay’sticks’to’the’block.’Aft er’the’ impact,’ the’ block’slides’7.50 ’ cm’before’coming’to’rest.’If’the’coefficient’of’ kinetic’ friction’between’the’block’and’the’surface’is’0.650,’what’was’the’ speed’of’the’clay’immediately’before’impact? Solution:’During’impact,’momentum’of’the’clay -block’system’is’conserved’i.e.:’ m 1 V 1 =(m 1 +m 2 )V 2 During’sliding,’the’change’in’kinetic’energy’of’the’c lay-block-surface’system’ is’equal’to’the’increase’in’the’internal’energy: 1 2 ! ! + ! ! ! ! ! = ! ! ! = ! ! ! + ! ! !" 1 2 0 . 112 !" ! ! ! = 0 . 650 0 . 112 !" 9 . 80 ! ! ! 0 . 075 ! ! ! ! = 0 . 956 ! ! ! ! = > ! ! = 0 . 977 !
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