128_Physics ProblemsTechnical Physics

# 128_Physics ProblemsTechnical Physics - 130*P5.30 The Laws...

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130 The Laws of Motion *P5.30 Both blocks move with acceleration a m m m m g = + F H G I K J 2 1 2 1 : a = + F H G I K J = 7 2 9 8 5 44 kg kg 7 kg 2 kg m s m s 2 2 . . . (a) Take the upward direction as positive for m 1 . v v a x x x x x xf xi x f i f f f 2 2 2 2 2 0 2 4 2 5 44 0 5 76 2 5 44 0 529 0 529 = + = − + = − = − = d i b g e jd i e j : . . . . . . m s m s m s m s m m below its initial level 2 2 2 (b) v v a t v v xf xi x xf xf = + = − + = : . . . . 2 40 5 44 1 80 7 40 m s m s s m s upward 2 e j a f P5.31 Forces acting on 2.00 kg block: T m g m a = 1 1 (1) Forces acting on 8.00 kg block: F T m a x = 2 (2) (a) Eliminate
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