11_InstSolManual_PDF_Part15

# 11_InstSolManual_PDF_Part15 - Elasticity and Periodic...

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gives His speed at the ground there- fore is This speed is related to his initial height h above the floor by and 11.66. Set Up: Let t be the duration of the chemical process and let T be the period of the pendulum. Then, the number of swings N is Let a subscript of E refer to the earth and M to the moon. Solve: is the same on earth and moon, so and 11.67. Set Up: A force of is applied to each section of the rod. From Table 11.1, and Solve: (a) gives (b) brass: steel: (c) brass: steel: 11.68. Set Up: The foot is in rotational equilibrium. Let counterclockwise torques be positive. Solve: (a) The free-body diagram for the foot is given in Figure 11.68, T is the tension in the tendon and A is the force exerted on the foot by the ankle. the weight of the person. Figure 11.68 (b) Apply with the pivot at the ankle: 2.72 times his weight. (c) The foot pulls downward on the tendon with a force of 2000 N. D l 5 1 F T YA 2 l 0 5 2000 N 1 1470 3 10 6 Pa 21 78 3 10 2 6 m 2 2 1 25 cm 2 5 4.4 mm T 5 1 12.5 cm 4.6 cm 2 1 75 kg 21 9.80 m / s 2 2 5 2000 N, T 1 4.6 cm 2 2 n 1 12.5 cm 2 5 0 g t 5 0, T n A 4.6cm 12.5cm Pivot n 5 1 75 kg 2 g , Y 5 F T / A D l / l 0 . strain 5 1.00 3 10 8 Pa 2.0 3 10 11 Pa
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Unformatted text preview: Pa 5 5.0 3 10 2 4 strain 5 5.00 3 10 7 Pa 0.91 3 10 11 Pa 5 5.5 3 10 2 4 ; strain 5 stress Y . F ' A 5 1.00 3 10 4 N 1.00 3 10 2 4 m 2 5 1.00 3 10 8 Pa F ' A 5 1.00 3 10 4 N 2.00 3 10 2 4 m 2 5 5.00 3 10 7 Pa; L 5 l 0, steel 5 l 0, brass 1 Y steel Y brass 21 A steel A brass 2 5 1 1.40 m 2 1 2.0 3 10 11 Pa 0.91 3 10 11 Pa 21 1.00 cm 2 2.00 cm 2 2 5 1.54 m F ' l 0, brass Y brass A brass 5 F ' l 0, steel Y steel A steel . D l steel 5 D l brass D l 5 F ' l YA . Y brass 5 0.91 3 10 11 Pa. 2.0 3 10 11 Pa Y steel 5 1.00 3 10 4 N N M 5 N E Å g M g E 5 1 10.0 swings 2 Å 1.67 m / s 9.80 m / s 2 5 4.13 swings N E " g E 5 N M " g M N E 2 p Å L g E 5 N M 2 p Å L g M . t 5 NT 5 N 2 p " L / g T 5 2 p Å L g t / T . h 5 v 2 2 g 5 1 35.7 m / s 2 2 2 1 9.80 m / s 2 2 5 65 m. 1 2 m v 2 5 mgh v 5 35.7 m / s. v y 5 2 a y t 5 1 2 1.19 3 10 3 m / s 2 21 0.030 s 2 5 35.7 m / s. v y 5 v y 1 a y t Elasticity and Periodic Motion 11-15...
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• Spring '07
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