130_Physics ProblemsTechnical Physics

130_Physics ProblemsTechnical Physics - 132 P5.33 The Laws...

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132 The Laws of Motion P5.33 First, we will compute the needed accelerations: 10 2 120 0 0800 150 30 4 01 2 0 af Before it starts to move: During the first 0.800 s: ms s While moving at constant velocity: During the last 1.50 s: s 2 2 a a vv t a a t y y yf yi y y yf yi = = = = = = = =− . . . . . . FIG. P5.33 Newton’s second law is: Fm a yy = +− = =+ Sa y y 72 0 9 80 72 0 706 72 0 .. . kg m s kg N k g 2 bg ej (a) When a y = 0, S = 706 N . (b) When a y = . m s 2 , S = 814 N . (c) When a y = S = 706 N . (d) When a y = . m s 2 , S = 648 N . P5.34 (a) Pulley P 1 has acceleration a 2 . Since m 1 moves twice the distance P 1 moves in the same time, m 1 has twice the acceleration of P 1 , i.e., aa 12 2 = . (b) From the figure, and using
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