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Exam2Sum11key - k-eu Name i July OS 20 11 Physics 1025 Exam...

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Name k-eu. . -/ ' July OS, 20 11 Physics 1025 Exam 2, MDC-IAC ·i· (2 0pts.) Determine how much force is required to pull the free rope end, in order to lift the block in each case below. The end of each rope is indicated by an arrowhead. There is only one free rope end in each case. Thick lines are only points of attachment. You must sh ow your work below (how each advantage is added or multiplied to determine a final mechanic al advanta ge ). A B Ans: \ <6 N C o Ans: ~ tJ - ,aN ~) Ht+ ; ( I, ;) _ ,3/1) - If: 1 - . I <2N J ' Lj- 7 -;;JN b) MA- : L\ .- 1)(2 =1) = ~~ j ~ - '7 rJ c, V It (t{ : I (I I :2 , 3) =- \ ~ I 7 - ~ N -= ~ N \'J d-) M 1\-< (4 : I ) ( 3" I) (~I) J Y J ?. IN - ~Lf
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Name __________ __ ______ _ J uly0 5, 2. 011 Physics 1025 Exam 2, MDC-IAC 2) (20pts.) a. Use vector analysis on the block on the incline below to determine if this system represents a static or a dynamic case when Ml = 15kg, Mz = 4kg, and 1\11 3 = 6kg (no credit will be given for guessing one or the other, you must show all work). If dynamic give the direction of acceleration. F~ =: (11 ~fO,-)~}) + ~ :: (\S~ )(ID'rAi)S,,,,3DO ( (P ~( (O'''l' ' : ~) : !~ \J 6 : «;~,hf i\""Q\~c ~0 CJ ..
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