mt2sol_11a

# mt2sol_11a - Phy 9A-C Midterm 2 Solutions Page 1 of 2...

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Unformatted text preview: Phy 9A-C, Midterm 2 Solutions, Page 1 of 2 5/20/11 Yellow F T F N mg f F N mg f Phyiscs 9A-C Midterm 2 Solutions Cole Yellow [1]  a) Í F√  =  0  b) never,  c) both,  d) position,  e) equal to,  f) spin faster,   g)  K m  > K M ,    h) none,   i) 0,   j)  momentum. [2]  a) (10 pts)   Use the work energy theorem   W T  = ÎK.      W F T = F T Δ x = 500 N ( ) 5 m ( ) = 2500 J While  F N   does no work it is needed for the  friction force:  Í F y  = F N  - mg  cos 36.9°  = 0 õ    F N = mg cos36.9 ° = 4 5 mg   õ    W f = − μ k F N Δ x = − μ k 4 5 mg Δ x  õ    W f = − 0.35 ( ) 4 5 30 kg ( ) 9.8 m/s 2 ( ) 5 m ( ) = − 411.6 J .   The only other force doing work is gravity:     W g = − mg ′ h = − 30 kg ( ) 9.8 m/s 2 ( ) 3 m ( ) = − 882.0 J882....
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mt2sol_11a - Phy 9A-C Midterm 2 Solutions Page 1 of 2...

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