05_InstSolManual_PDF_Part19

05_InstSolManual_PDF_Part19 - sin u 2 m s n 5 0 g F x 5 ma...

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Solve: so and so so and At and At and Reflect: Usually so If the angle is kept at the box will accelerate down the incline once it has been set into motion. 5.42. Set Up: Take to be parallel to the incline and directed down the incline. Solve: (a) In the absence of friction the free-body diagram for the van is as given in Figure 5.42a. gives and Figure 5.42 (b) The free-body diagram with friction is given in Figure 5.42b. gives gives and 5.43. Set Up: Take to be down the incline. At the maximum angle, the static friction force has its maximum value, Solve: The free-body diagram for the patient is given in Figure 5.43. gives gives and Figure 5.43 mg mgcos u mgsin u u y n a 5 0 x u 5 50°. tan u 5 m s mg sin u 2 m s mg cos u 5 0. mg sin
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Unformatted text preview: sin u 2 m s n 5 0. g F x 5 ma x n 5 mg cos u . g F y 5 ma y f s 5 m s n . 1 x a 5 g 1 sin u 2 m k cos u 2 5 4.80 m / s 2 . mg sin u 2 m k mg cos u 5 ma mg sin u 2 m k n 5 ma . g F x 5 ma x n 5 mg cos u . g F y 5 ma y mg sin u mg cos u u mg y ( b ) x n f k = m k n a v ( a ) mg cos u mg sin u u mg x y n a 5 g sin u 5 1 9.80 m / s 2 2 sin 40.0° 5 6.30 m / s 2 mg sin u 5 ma g F x 5 ma x 1 x u 1 u 2 , u 1 . m k , m s , m k 5 tan u 2 . f 5 f k u 5 u 2 , m s 5 tan u 1 . f 5 f s u 5 u 1 , m 5 tan u . m mg cos u 5 mg sin u f 5 m n 5 m mg cos u f 2 mg sin u 5 g F x 5 ma x n 5 mg cos u . n 2 mg cos u 5 g F y 5 ma y Applications of Newton’s Laws 5-19...
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