Answers to Problem Set 5

• Ch. 8

Answers for the even numbered problems:

8-20. v = [2 g L (1-cos theta)]^1/2 = 2.29 m/s

8-30. Delta U = gh (m₁ sin theta - m₂), Delta K = - Delta U = 3.7 J

8-36. d₂ = (v₂/v₁) d₁ = 1.25 cm

8-40. No, the vine doesn't break; F_max = 933 N

8-50. (a) W_appl = 5.6 J; (b) W_d = - 3.5 J

8-76. This is a derivation, so the answer is given in the problem.

8-86. (a) v_o = (2gL)^1/2; (b) T = 5mg; (c) Delta E = - mgL; (d) Delta E_total = - 2 mgL

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Last modified 1 March, 2000. © Gregory C. Sloan.