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S12_final

# S12_final - General Physics 171.101 Final Exam May 16 2012...

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General’Physics’171.101 ’ Final’Exam ’ May’16,’2012 ’ Answer’all’ five’ questions.’VERY’IMPORTANT:’YOU’MUST’SHOW’AND’EXPLAIN’ALL’ YOUR’WORKING’TO’GET’FULL’CREDIT.’Partial’credit’will’given ’ for’partially -correct’ answers.’Pace’yourself’to’make’sure’you’have’enough’time’to’answer’each’ question.’ Each’ questions’ is’worth’50’points. ’ Please’write’the’following’on’your’blue’book’and’sign’and’date: ’ “I’agree’to’complete’ this’exam’without’unauthoriz ed’assistance’from’any’person,’materials’or’device. ”’ The’exam’is’open’book,’open’notes,’no’cell -phone,’no’laptop’(unless’authorized’by’ Disability’Support’Services’in’advance) Time’allowed:’3’hours ’ 1)’A’car’drives’ at’a’constant’speed’of’20’m/s’ around’a’ perfectly-horizontal’ circular’ track’of’radius’100’ m.’ ’ Take’the’acceleration’due’to’gravity’as’9.8’m’s –2’ (Noooo….’Not’again!’ ’ Yep,’sorry.) ’ a)’How’long’does’the’car’take’to’complete’one’lap,’and’what’is’its’centripetal’ acceleration?’ b)’ If’the’car’is ’ to’avoid’skidding,’w hat’is’the’minimum’coefficient’of’static’friction’for’ the’tires’on’the’road? c)’If’the’driver’has’a’mass’of’70’kg,’what’is’the’magnitude’of’the’force’exerted’by’the’ car’seat’on’the’driver?’

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The next two parts are for extra credit (10 points each): A’ passenger’attempts’to’shoot’a’target’at’
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