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99_Physics ProblemsTechnical Physics

99_Physics ProblemsTechnical Physics - 100 P4.44 Motion in...

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100 Motion in Two Dimensions P4.44 (a) To an observer at rest in the train car, the bolt accelerates downward and toward the rear of the train. a = + = = = = ° 2 50 9 80 10 1 2 50 9 80 0 255 14 3 2 2 . . . tan . . . m s m s m s m s m s . to the south from the vertical 2 2 2 b g b g θ θ (b) a = 9 80 . m s vertically downward 2 P4.45 Identify the student as the S ’ observer and the professor as the S observer. For the initial motion in S ’, we have = °= v v y x tan . 60 0 3 . Let u represent the speed of S ’ relative to S . Then because there is no x -motion in S , we can write v v u x x = ′ + = 0 so that ′ = − = − v u x 10 0 . m s . Hence the ball is thrown backwards in S ’. Then, v v v y y x = ′ = ′ = 3 10 0 3 . m s . Using v gh y 2 2 = we find
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