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EXAM3 Key - PHYS 121 (FA08) EXAM 3 50 pts maximum NAME...

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Unformatted text preview: PHYS 121 (FA08) EXAM 3 50 pts maximum NAME (print clearly): Discussion Section #: You can bring a 3x5 inch index card. Only non-programmable and non-graphing calculator is allowed. You must show all work, not just the answers. A correct answer alone will receive zero points. Q 1. Bobis runningfromthe policeandthinkshe canmakea fastergatewaybyjumpingon a stationarycart in front of him. He runs toward the cart, jumps on, and rolls along the horizontal street. Bob has a mass of 80 kg and the cart's mass is 20 kg. If Bob's speed is 4.0 mIs when he jumps onto the cart, what is the cart's speed after Bob jumps on? Did he make a smart decision by jumping on the cart? (Forfull credityour solution must include a description of your plan for solving theproblem from fundamental equations, proper units, and an answer to the q~estionposed in the problem.) (8 pts) I Gmsickr /!J:Jp rj * y~lf It ~rlw1 ) t4, p'<iMlUII") 15 ?fl5i''''cL g,- p; I~\ I J ~ ~ ~ I~I? trP,j + 111 [ ['of ~ [!1l> IN t Ii1 ( Uc i., ., ,pi ~ "01 vi ) ~ I tl wL- )~{{/! ~:/5J{Tfl (rlB+ (n( ) tf f = (1)8 ~ (1')5) . 1- fI)L /0' /5 . ") I . ' i~ ( _ i . ~(/ 'Au:-- j, '::> ~ ) 'a) 15 510uff Iltl . (Jc'r ) i1j . 5) ~r ,/ J( ?' I' r (I.: =-- _ ' = 3.2 /1;5 f (3tff-1 A~ ) _ ~ t P%b tIr ttfr_!.~~?n Q2. A 100 g rubber ball is thrown horizontally with a speed of 4.~ t~d a wall. It is initially traveling to the left. It rebounds with no loss of speed. The collision force is shown in the top graph below. Assume to thethe left....
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EXAM3 Key - PHYS 121 (FA08) EXAM 3 50 pts maximum NAME...

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