43_Physics ProblemsTechnical Physics

43_Physics ProblemsTechnical Physics - 44 P2.56 Motion in...

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44 Motion in One Dimension P2.56 a dv dt v == 300 2 ., v i = 150 . m s Solving for v , dv dt v = 2 . vd v d t vv tt v t t ii i zz =− −+ = 2 0 11 . .. . or When v v i = 2 , t v i 1 0222 . s . Additional Problems *P2.57 The distance the car travels at constant velocity, v 0 , during the reaction time is ∆∆ xv t r af 1 0 = . The time for the car to come to rest, from initial velocity v 0 , after the brakes are applied is t a v a v a fi 2 00 0 = = = and the distance traveled during this braking period is t t a v a a f 2 22 0 2 2 0 + F H G I K J = + F H G I K J F H G I K J . Thus, the total distance traveled before coming to a stop is sx x v t v a r stop =+= af af 12 0 0 2 2 . *P2.58 (a) If a car is a distance sv t v a r stop 0 0 2 2 (See the solution to Problem 2.57) from the intersection of length s i when the light turns yellow, the distance the car must travel before the light turns red is xs s vt v a s ir i =+ = + stop 0 0 2 2 . Assume the driver does not accelerate in an attempt to “beat the light” (an extremely
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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