52_Physics ProblemsTechnical Physics

52_Physics ProblemsTechnical Physics - 53 Chapter 2 P2.75...

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Chapter 2 53 P2.75 The distance x and y are always related by xyL 222 += . Differentiating this equation with respect to time, we have 220 x dx dt y dy dt Now dy dt is v B , the unknown velocity of B ; and dx dt v = . From the equation resulting from differentiation, we have dy dt x y dx dt x y v = F H G I K J = −− () . B O y A α x L v x y FIG. P2.75 But y x = tan so vv B = F H G I K J 1 tan . When 60 0 ., v v B = ° == tan . . 60 0 3 3 0577 . ANSWERS TO EVEN PROBLEMS P2.2 (a) 21 0 7 × ms; 11 0 6 × P2.24 (a) 1.88 km; (b) 1.46 km; (c) see the solution; (b) 5 10 8 × yr (d) (i) xt 1 2 167 = . m s 2 ej ; P2.4 (a) 50 0 . m s; (b) 41 0 . ms (ii) 2 50 375 =− ms m bg ; (iii) t 3 2 250 2 5 4 375 m 2 .; P2.6 (a) 27 0 . m ; (e) 37 5 (b) 270 180 300 2 .. . mm s m s 2 ++ a f ∆∆ tt ; (c) 18 0 P2.26 958 m P2.8 (a), (b), (c) see the solution; 46 2 ; (d) 0 P2.28 (a) t f 30 0 2 . m; vt f 30 0 2 . af (b) 225 m P2.10 5.00 m P2.12 (a) 20 0 ; 500 . m s; (b) 262 m P2.30 xxv t a t fix f x −= − 1 2 2 ; 310 s P2.14 (a) see the solution; P2.32 (a) 35.0 s; (b) 15 7 (b) 160 m s 2 ;
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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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