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296_Physics ProblemsTechnical Physics

# 296_Physics ProblemsTechnical Physics - 298 P10.33 Rotation...

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298 Rotation of a Rigid Object About a Fixed Axis P10.33 In the previous problem we calculated the maximum torque that can be applied without skidding to be 882 N · m. This same torque is to be applied by the frictional force, f , between the brake pad and the rotor for this wheel. Since the wheel is slipping against the brake pad, we use the coefficient of kinetic friction to calculate the normal force. τ µ = = fr n r k b g , so n r k = = = × = τ µ 882 0 220 8 02 10 8 02 3 N m 0.500 m N kN a fa f . . . Section 10.7 Relationship Between Torque and Angular Acceleration P10.34 (a) I MR = = × = × 1 2 1 2 2 00 7 00 10 4 90 10 2 2 2 3 . . . kg m kg m 2 b g e j α τ α ω ω α π = = × = = = = = I t t 0 600 4 90 10 122 1 200 122 1 03 3 2 60 . . . rad s s 2 c h (b) θ α = = = = 1 2 1 2 122 1 03 64 7 10 3 2 2 t rad s s rad rev b ga f . . . P10.35 m = 0 750 . kg , F = 0 800 . N (a) τ = = = rF 30 0 0 800 24 0 . . . m N N m a f (b) α τ = = = = I rF mr 2 2 24 0 0 750 30 0 0 035 6 . . . . a f rad s 2 (c) a r t = = = α 0 035 6 30 0
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