EXAM2 Key

EXAM2 Key - NAME (print clearly): PHYS 121 (FAG8) EXAM 2 50...

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Unformatted text preview: NAME (print clearly): PHYS 121 (FAG8) EXAM 2 50 pts maximum 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. Q1. You (m = 60 kg) try to cross a river by swinging from an 8.0-m long vine. Your speed at the bottom of the swing(as youjust clearthe water)is 7.0 mls. You do notknowthatthe vinehas a breakingstrengthoflOOON. a) Draw a proper free-body diagram for the situation in a coordinate system. (2 pts) /ltd ic /vae f I & aJ ~t- I :/;c t't tt07 j;fIPit 1Aefft , b) Can you make it safely across the river without breaking the vine? Give the tension in the vine at the bottom of your swing to support your answer. (10 pts) ,J I ~ C{JTtr;r' ~ ls F wkl ~ ~-/tNim rR (-1 tk Villf ) aNi-iii' f'vitftiilwt< ~ fTl ~ Fnd ~ fr ~ /717 r rid ~ T- Ft1 4-1r~aml~ fc ilrrw) ~ T- ~ rL . oJ T;: my + FJ ;;; 1177-1-1 1 :: bdf.;. 17"'M)....
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This note was uploaded on 08/28/2011 for the course PHYS 121 taught by Professor Angerson during the Spring '07 term at UMBC.

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EXAM2 Key - NAME (print clearly): PHYS 121 (FAG8) EXAM 2 50...

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