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352_Physics ProblemsTechnical Physics

352_Physics ProblemsTechnical Physics - 354 Static...

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354 Static Equilibrium and Elasticity Section 12.3 Examples of Rigid Objects in Static Equilibrium P12.9 τ == 03 mg r Tr a f 24 5 0 0 45 0 2 1500 450 2 530 9 80 530 177 TM g T Mg g m T g −° = = ° = ° = = sin . sin . sin . . kg N kg bg af a f m 3 r θ = 45° 1 500 kg FIG. P12.9 *P12.10 (a) For rotational equilibrium of the lowest rod about its point of support, = 0 . +− 12 0 1 . g 3 cm 4 cm gm g m 1 900 = . g (b) For the middle rod, + = m 2 21 2 0 9 0 5 0 cm g g cm .. m 2 52 5 = . g (c) For the top rod, 525 120 90 4 6 0 3 . g g cm ++ = m m 3 49 0 = P12.11 F g standard weight ′ → F g weight of goods sold FF F gg g 0240 0260 13 12 100 13 12 1 100 8 33% . =′ F H G I K J F H G I K J =− F H G I K J ×= 24.0 cm 26.0 cm F g F g FIG. P12.11 *P12.12 (a) Consider the torques about an axis perpendicular
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