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Physics125W99exam2

# Physics125W99exam2 - DUuNfiL Phvsics125Exam#2 Winter1999...

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DUuNfiL Phvsics 125Exam #2: Winter 1999 EXAM FORM #3 Student Number: This exam containslO multiple choice problems and 4 partial credit problems.You have 90 minutes to complete the exam, and you may useyour calculator. The final page of this exam is the equation sheet. You can tear it ofand useit throughout the exam ifyou like. ll/LL t( qs OG CE o? 03 L (7 tLl bq t << -</ il.,gdr4nr JJ Jo

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1: At the swimming hole, girl grabs the rope to swing into a pool in theposition shown. The length of the rope is 10m. What is her speed at the bottom of her swing? ) ) 3.2rnls Depends on her mass c d e 4y' a, v+ -4, vt u 7,6 \= 'e l()- , v.= I o= , (, q '"1 JY lqr ? 1, I ') .1 a) b) c) 9lJl?.}a\2MgR [email protected] 4, y = /Oto;loo - n%'. 2 t/ -r 2: A daredevil driver races his car of mass M at velocity v around a vertical loop of radius R as shownin the picture. What is the total work done on his car by the forceof gravityas he tavels from point A to point B? Mvz/R MgR MR/v \_-/(
3: A child pulls her linle brother on a sled as shown in the drawing. The force she applies is a constant 50N. The coefficient of friction between the sled and the snow is p4 = 0.2. How much work does she do while raveling to the park 40Om away? a a) 4ooJ / 1o urr=l a -4\ }!?g-oH ,/ el Y ./ ,I (c) 17300J ) - F ) -. /\ a -\--z \ e) 84oor 6*= 7O It a -cS]>C" \ o= q 3N 30o V, €L,n_ As o = .t3N, 'lNy 'r I I Aoo T 4: A boy runs at 6m/s towards a patch of ice. Once he reaches it he holds his feet steady and slides across the ice. If he travels l4m before coming to rest,what is the coefficient of friction between his shoes and the ice?

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