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167_Physics ProblemsTechnical Physics

# 167_Physics ProblemsTechnical Physics - Chapter 6(b 169 The...

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Chapter 6 169 (b) The time for which the box slides is given by xv v t agt t ag xi xf k k =+ −= L N M O Q P = F H G I K J 1 2 1 2 02 2 12 di bg AA A µ . The car in the Earth frame acquires finals speed vva t a xf xi k = + F H G I K J 0 2 A . The speed of the box in the Earth frame is then vvv a g a a g g g v be bc ce k k k k k k k k k =+= + F H G I K J = −− + = = = 2 2 22 2 2 2 2 A A A A A A a f a f af . *P6.28 Consider forces on the backpack as it slides in the Earth frame of reference. F ma n mg ma n m g a f m g a Fm a m gam a yy k k xx k x = = + =−+ = :, , : The motion across the floor is described by Lv t a t v t ga t xk =− + 1 2 1 2 . We solve for k : vt L g a t k + 1 2 2 , 2 2 vt L t k + = a f . P6.29 In an inertial reference frame, the girl is accelerating horizontally inward at v r 2 2 570 240 13 5 == . . . ms m 2 In her own non-inertial frame, her head feels a horizontally outward fictitious force equal to its mass
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