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GAP1_Exam2

# GAP1_Exam2 - Nrune P hysics Department Duquesne University...

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KEY Nrune ______________ __ ______ __ Physics Department Duquesne University EXAM #2 PH2Il-01 GAP I October 22. 2004 " .. Read everything carefully! This test covers Chapters 5 -7. There are 5 multiple-choice questions worth 5 points each, and 5 long-answer questions worth 15 points each. There are 100 points possible. Partial credit will be given for the long-answer questions, but only ifyou show your work and your reasoning is clear!!! Please also show your work on the multiple-choice questions. 1. A heavy baJl is suspended as shown. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result . occurs because: ,_ W;tt-. 0. 4-s-t ~,d\ I -K. . bd \ UPPIlr sti ng JLo~, .... -t \..... v. 1-iM. 1- ""ovo. "",,-J. .. 0EcA\.l~Eo of :n ~; ,~ttU: 4~ So +t. ... ~c. . ;, vt,t ~N"";I\.J. +0 lo~r string -\leo. v.f~e-r bh-,~ ,~ -tke- low •...- ~\:o ·k4 , A) the force is too small to move the ball C) air friction holds the ball back ~he ball has ine ~ D) the ball has too much energy 2. An object ofmass l::g is whirled in a horizontal circle ofr~4ius 0.5 m at a con,s.tant spee~ ',. 0'[2

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GAP1_Exam2 - Nrune P hysics Department Duquesne University...

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