05_InstSolManual_PDF_Part30

# 05_InstSolManual_PDF_Part30 - 5-30 Chapter 5 5.72 Set Up...

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5.72. Set Up: The free-body diagrams for the shuttle and astronaut are given in Figures 5.72a and 5.72b. is the thrust and n is the force of the seat on the astronaut. The mass of the astronaut is 74.0 kg. Figure 5.72 Solve: (a) Find a : gives Shuttle: gives and (b) astronaut: gives and 5.73. Set Up: The unstretched length of the tendon is 20.0 cm. The weight W suspended from the end of the tendon equals the force applied by the tendon. Solve: (a) so Hooke’s law says The graph of W versus L is of this form. (b) k is the slope of W versus x , so (c) 5.74. Set Up: The net force at any time is Solve: (a) At This force is 62 times the flea’s weight. (b) The maximum acceleration is 140 g at 5.75. Set Up: On Mars, The free-body diagrams in each stage are shown in Figure 5.75a-c. is the air drag force in Stage I, is the force from the parachute in Stage II and is the force from the retrorockets in Stage III.
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Unformatted text preview: Figure 5.75 x y mg F D mg F P mg F R Stage I ( a ) ( b ) ( c ) x y Stage II x y Stage III a a a F R F P F D g M 5 0.379 g E 5 3.71 m / s 2 . F net 5 140 mg 5 2.9 3 10 2 4 N. t 5 1.2 ms. F net 5 ma 5 62 mg 5 62 1 210 3 10 2 9 kg 21 9.80 m / s 2 2 5 1.3 3 10 2 4 N. a 5 62 g . t 5 0, F net 5 ma . W 5 kx 5 1 50.0 N / m 21 0.080 m 2 5 4.0 N k 5 15.0 N 0.500 m 2 0.200 m 5 50.0 N / m W 5 kx 5 kL 2 kL . x 5 L 2 L L n 5 m a 1 a 1 g 2 5 1 74.0 kg 21 5.59 m / s 2 1 9.80 m / s 2 2 5 1.14 3 10 3 N n 2 m a g 5 m a a g F y 5 ma y F T 5 m r 1 a 1 g 2 5 1 2.04 3 10 6 kg 21 5.59 m / s 2 1 9.80 m / s 2 2 5 3.14 3 10 7 N F T 2 m r g 5 m r a g F y 5 ma y a 5 v t 5 5.59 m / s 2 . v 5 v 1 at t 5 8.0 s. v 5 0. v 5 161 km / h 5 44.7 m / s. ( a ) x y m a n x y m r F T ( b ) a a F T 5-30 Chapter 5...
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• Spring '07
• Shoberg
• Force, Mass, 2 m, 2 L, 5 62g, 5 62mg, 5 140mg

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