93_Physics ProblemsTechnical Physics

93_Physics ProblemsTechnical Physics - 94*P4.25 Motion in...

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94 Motion in Two Dimensions *P4.25 The arrow’s flight time to the collision point is t xx v fi xi = = ° = 150 45 50 519 m ms s bg cos .. The arrow’s altitude at the collision is yy v t a t fiy i y =+ + =+ ° + − = 1 2 04 5 5 0 5 1 9 1 2 98 470 2 2 s s m 2 af ej sin . . . . . (a) The required launch speed for the apple is given by vv a y y v v yf yi y f i yi yi 22 2 2 02 9 8 4 7 0 30 3 = di . m 2 (b) The time of flight of the apple is given by vva t t t yf yi y =− = 0 303 310 s 2 So the apple should be launched after the arrow by 209 . s s s −= . *P4.26 For the smallest impact angle θ = F H G I K J tan 1 v v yf xf , we want to minimize v yf and maximize xf xi =
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