Final_Exam_S03_Solutions.doc - (2m)g 3H 4 = 3mgH 2 (Yes!) I...

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Physics 112 – Final Exam Solutions 1. G 2. C 3. (a) A (b) B 4. (a) E (b) A (c) F 5. (a) No B (b) Yes C (c) Yes E (d) B (e) B 6. (a) (b) gravitational, up ( ), the Earth, the ball (c) C N Mg f s 7. (a) 10 cm (b) 8 s (c) π s -1 (d) - π /2 (e) 4 π 8. (a) 2Mv o h (b) I = 1 2 MR 2 + 2 1 2 MR 2 + M(2R) 2 = 9.5 MR 2 = 19 2 MR 2 (c) Yes A (d) No D (e) Yes E (f) Cons. of Ang. Mom.: 2Mv o h = I ω ω = 2Mv o h I = 2Mv o h 19 2 MR 2 = 4v o h 19R 2 9. (a) About pole's lower end: Σ τ = TL - w L 2 cos θ = 0 T = w cos θ 2 = (5000 N)(4/5) 2 = 2000 N (b) Σ F y = T cos θ - w + N = 0 N = w - T cos θ = 5000 N - (2000 N)(4/5) = 3400 N Σ F x = T sin θ - f = 0 f = T sin θ = (2000 N)(3/5) = 1200 N F ground = N 2 + f 2 = (3400 N) 2 + (1200 N) 2 = 3600 N
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10. (a) B (b) Cons. of Energy: K f + U gf = K o + U go 1 2 I ω 2 + 0 = 0 + mgH + mg H 2 = 3mgH 2 = 0 + Mgy CM = 0 +
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Unformatted text preview: (2m)g 3H 4 = 3mgH 2 (Yes!) I = mH 2 + m H 2 2 = 5 4 mH 2 2 = 3mgH I = 3mgH 5 4 mH 2 = 12g 5H v = H = 12gH 5 = 2 3gH 5 = 1.55 gH 11. (a) About A: = N B D - Mg x + D 2 = 0 N B = Mg 1 2 + x D F y = N A + N B- Mg = 0 N A = Mg - N B = Mg 1 2-x D (b) F x = f kA- f kB = k (N A- N B ) = - 2 k Mg D x k eff = 2 k Mg D (c) f = 1 2 k eff M = 1 2 2 k g D...
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This note was uploaded on 06/01/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Spring '07 term at Cornell University (Engineering School).

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Final_Exam_S03_Solutions.doc - (2m)g 3H 4 = 3mgH 2 (Yes!) I...

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