207_Physics ProblemsTechnical Physics

207_Physics ProblemsTechnical Physics - Chapter 7 P7.58 (a)...

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Chapter 7 209 P7.58 (a) The new length of each spring is xL 22 + , so its extension is xLL +− and the force it exerts is kx L L F H I K toward its fixed end. The y components of the two spring forces add to zero. Their x components add to Fi i =− + F H I K + + F H G I K J 1 ±± x kx L . FIG. P7.58 (b) WF d x x i f = z Wk x L dx A + F H G I K J z 21 0 x d x k L x L x d x AA + + zz 0 12 0 ej x kL A A + + 2 2 2 0 0 bg A k L k L A L =− + + + 02 2 2 2 L k Ak L A L =+ + 2 2 *P7.59 For the rocket falling at terminal speed we have Fm a RM g Mg D Av T = = = 0 1 2 2 ρ (a) For the rocket with engine exerting thrust T and flying up at the same speed, a TM gR g = − = = 0 2
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