Final_Exam_S05_Solns - Physics 112 - Final Exam Solutions...

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B w F 1 due to water due to Earth due to scale #1 B' F 2 w w w b + due to due to block due to scale #2 p 1i p 2i p p total p p p - p 2 p 2 T mg Mg F ground Physics 112 — Final Exam Solutions Spring 2005 1. (a) (b) (c) B and B' [2 pts] [-1 pt for each additional incorrect pair, min. = 0] (d) 18 N (e) 26 N (f) C (g) C [ 2 pts, -1 for each additional incorrect answer, min. = 0] 2. (a) 8 cm (b) 12 s (11-13 s OK) (c) π s -1 (d) π or – π (e) 6 π 19 [2 pts each, –1 for incorrect/missing units. Check for consistency of (e) with (b) and (c).] 3. (a) C (b) A (c) C, B (d) F (e) C 4. G and K [2 pts each, -1 for each additional incorrect answer, min. = 0] 5. [3 points each for a correct construction as shown or the equivalent.] 6. (a) F (b) F (c) F (d) F (e) F (f) T, F 7. (a) (b) about lower end of pole: Σ τ = mgDcos θ + Mg(D/2)cos θ - TDsin α = 0 T = m + M 2 g cos θ sin α (c) Σ F x = Tcos( α - θ ) – F ground h = 0 F ground h = T cos( α - θ ) Σ Fy = F ground v + Tsin( α - θ ) – mg – Mg = 0 (d) B F ground v = mg + Mg - T sin( α - θ )
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+y +x a x 60°
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This test prep was uploaded on 04/21/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).

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Final_Exam_S05_Solns - Physics 112 - Final Exam Solutions...

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