solns3A-1

solns3A-1 - EXAM 3A SOLUTIONS Part I Multiple Choice...

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EXAM 3A SOLUTIONS Part I – Multiple Choice Questions 1) A 2) B 3) D 4) A 5) B Part II – Word Problems 1) ω 0 = 1200 rpm = 40 π rad/s; = 5500 rpm = 550 π /3 rad/s (A) α = 0 t = 180 rad/s 2 (B) θ = 1 2 ( 0 + ) t = 140 rev (C) Σ τ = I = 1.62 N-m 2) (A) I = 1/3 ML 2 + mr 2 = 0.627 kg-m 2 (B) Energy conservation: ½ I 2 = ( M + m ) gh = 2.93 rad/s (C) Angular momentum conservation:
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