145_Physics ProblemsTechnical Physics

# 145_Physics ProblemsTechnical Physics - Chapter 5 P5.59...

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Chapter 5 147 P5.59 With motion impending, n T mg f mg T s + = = sin sin θ µ θ 0 b g and T mg T s s cos sin θ μ μ θ + = 0 so FIG. P5.59 T mg s s = + μ θ μ θ cos sin . To minimize T , we maximize cos sin θ µ θ + s d d s s θ θ µ θ θ µ θ cos sin sin cos + = = − + b g 0 . (a) θ μ = = = ° tan tan . . 1 1 0 350 19 3 s (b) T = °+ ° = 0 350 1 30 9 80 19 3 0 350 19 3 4 21 . . . cos . . sin . . kg m s N 2 a fc h *P5.60 (a) See Figure (a) to the right. (b) See Figure (b) to the right. (c) For the pin, F ma C C y y = = = : cos cos . θ θ 357 0 357 N N For the foot, m g = = 36 4 9 8 357 . . kg m s N 2 a fc h FIG. P5.60(a) FIG. P5.60(b)
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