Ex1_Sp05

# Ex1_Sp05 - PHYSICS 220 EXAM 1 This exam consists of 13...

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PHYSICS 220 EXAM 1 February 23 2005 This exam consists of 13 problems. Please check that you have all of them. One (both sides) 8 1/2" x 11" crib sheet is allowed. It must be of your own creation. Useful formulas and constants: sinO=:. yl r cosO= xl' tanO == yl x i",\, ! "~,. "'\, ~ ; ~' ..... , r y I '\,. .... ,. f .~,.~ I 8'( "'.." L ""._ .. ~.",~.~,i_.L.~.~~ ,~~ .. :::;i. x g = 9.8m/ S2 Constant acceleration 1 ., x = X o + vot + - at- 2 v = V o + at 2 _ 2 ,., ( ) v -Va +~a X-X o F,ret = rna F max N friction = Jl s Ffrictioll = JL K N F - Gm\m 2 g rallilV - , . r- a = v 2 I r c G = 6.67xlO- 11 Nm 2 / kg 2 F:pring =-Iex f=l/T Constant angular acceleration e 1 ? = eo + OJot + -at- OJ = OJ o + at 2 B=slr m=vlr Please sign the opscan sheet and print your name on it. Use a #2 pencil to fill in your full name, your student identification number (old one), and finally the answers for problems 1-13. Please be prepared to show your Purdue ill when you hand in your opscan sheet. Page 1

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1. An 80 kg person is riding in an elevator that is accelerating at 2.4 m/s 2 downward. The weight of the 80 kg person measured on a scale in the elevator is: A) 592 N B) 639 N C) 784 N D) 855 N E) 976 N 2. During normal operation, a con1puter's hard disk spins at 7,200 rpn1. Ifit takes the hard disk 4 s to
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