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79_Physics ProblemsTechnical Physics

# 79_Physics ProblemsTechnical Physics - 80 Motion in Two...

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80 Motion in Two Dimensions Q4.7 The balls will be closest together as the second ball is thrown. Yes, the first ball will always be moving faster, since its flight time is larger, and thus the vertical component of the velocity is larger. The time interval will be one second. No, since the vertical component of the motion determines the flight time. Q4.8 The ball will have the greater speed. Both the rock and the ball will have the same vertical component of the velocity, but the ball will have the additional horizontal component. Q4.9 (a) yes (b) no (c) no (d) yes (e) no Q4.10 Straight up. Throwing the ball any other direction than straight up will give a nonzero speed at the top of the trajectory. Q4.11 No. The projectile with the larger vertical component of the initial velocity will be in the air longer. Q4.12 The projectile is in free fall. Its vertical component of acceleration is the downward acceleration of gravity. Its horizontal component of acceleration is zero.
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