431_Physics ProblemsTechnical Physics

431_Physics ProblemsTechnical Physics - Chapter 14 P14.67...

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Chapter 14 433 P14.67 Inertia of the disk: IM R == = 1 2 1 2 10 0 0 250 0 312 2 2 .. . kg m kg m 2 bg af Angular acceleration: ωω α fi t =+ π = F H G I K J F H G I K J F H G I K J =− 03 0 0 60 0 21 0524 rev min s rad 1 rev min 60.0 s rad s 2 . . Braking torque: τα =⇒ −= If d I , so f I d = Friction force: f = = 0312 0220 0744 . . kg m rad s m N 22 ej Normal force: fn n f k k = = = µ 149 . . N 0.500 N gauge pressure: P n A × = 758 2 2 . N 2.50 10 m Pa P14.68 The incremental version of PP g y 0 ρ is dP gdy We assume that the density of air is proportional to pressure, or P P ρρ = 0 0 Combining these two equations we have dP
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