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111_Physics ProblemsTechnical Physics

# 111_Physics ProblemsTechnical Physics - 112*P4.70 Motion in...

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112 Motion in Two Dimensions *P4.70 Let the river flow in the x direction. (a) To minimize time, swim perpendicular to the banks in the y direction. You are in the water for time t in y v t y = , t = = 80 1 5 53 3 m m s s . . . (b) The water carries you downstream by x v t x = = = 2 50 53 3 133 . . m s s m b g . (c) K v s K v w K v s K v w + K v s K v w K v s K v w + K v s K v w K v s K v w + To minimize downstream drift, you should swim so that your resultant velocity K K v v s w + is perpendicular to your swimming velocity K v s relative to the water. This condition is shown in the middle picture. It maximizes the angle
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