05_InstSolManual_PDF_Part9

# 05_InstSolManual_PDF_Part9 - s 2 2 5 1.40 3 10 5 N F 2 w 5...

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5.18. Set Up: Let the person’s weight be W , so Assume constant acceleration during the speeding up motion and assume that the body moves upward 15 cm in 0.50 s while speeding up. The free-body diagram for the person is given in Figure 5.18. F is the force exerted on him by his arms. Figure 5.18 Solve: gives gives so 5.19. Set Up: Solve for the net force on the ball. Solve: gives Reflect: The acceleration is much larger than g and the net force is much larger than the weight of the ball. 5.20. Set Up: The mass of the spaceship is Take to be upward, away from the ground. Solve: (a) The free-body diagram is given in Figure 5.20. F is the braking force. Figure 5.20 (b) gives gives and F 5 w 1 ma y 5 75,600 N 1 1 7714 kg 21 8.33 m / s 2
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Unformatted text preview: / s 2 2 5 1.40 3 10 5 N F 2 w 5 ma y g F y 5 ma y a y 5 v y 2 v y t 5 2 1 2 1.00 3 10 3 m / s 2 120 s 5 8.33 m / s 2 . v y 5 v y 1 a y t t 5 120 s. v y 5 0, v y 5 2 1.00 3 10 3 m / s, v y a x y w F 1 y w / g 5 7714 kg. F net 5 ma 5 1 W / g 2 a 5 250 W . a 5 v 2 v t 5 73.14 m / s 30 3 10 2 3 s 5 2.44 3 10 3 m / s 2 . v 5 v 1 at t 5 30 3 10 2 3 s. v 5 73.14 m / s, v 5 0, F net F 5 W 1 1 1 a g 2 5 1.12 W 5 762 N. m 5 W g , F 2 W 5 ma . g F y 5 ma y a y 5 2 1 y 2 y 2 t 2 5 2 1 0.15 m 2 1 0.50 s 2 2 5 1.2 m / s 2 y 2 y 5 v y t 1 1 2 a y t 2 t 5 0.50 s. y 2 y 5 0.15 m, v y 5 0, a x y W F W 5 680 N. Applications of Newton’s Laws 5-9...
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