212_Physics ProblemsTechnical Physics

212_Physics ProblemsTechnical Physics - 214 Energy and...

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214 Energy and Energy Transfer ANSWERS TO EVEN PROBLEMS P7.2 159 10 3 . × J P7.44 592 . k m L P7.46 90.0 J P7.4 (a) 328 10 2 . × J; (b) −× 328 10 2 J P7.48 (a) cos α = A A x ; cos β = A A y ; cos γ = A A z ; P7.6 see the solution (b) see the solution P7.8 5.33 W P7.50 (a) a m = 40 1 1.8 . kN ; b = 180 . ; (b) 294 J P7.10 16.0 P7.12 (a) see the solution; (b) 12 0 J P7.52 (a) mgnhh vn h s s + ; (b) mgvh h s + P7.14 50.0 J P7.16 (a) 575 N m; (b) 46.0 J P7.54 153 10 5 . × N upward P7.18 (a) 9.00 kJ; (b) 11.7 kJ, larger by 29.6% P7.56 see the solution P7.20 (a) see the solution; (b) mgR P7.58 (a) see the solution; (b) 22 2 2 kL kA kL A L +− + P7.22 (a) mg k mg k 12 + ; (b) 11 1 kk + F H G I K J P7.60 (a) Fi j 1 20 5 14 3 =+ . ± . ± ej N; j 2 36 4 21 0 =− + . ± . ± P7.24 (a) 1.20 J; (b) 500 . m s; (c) 6.30 J (b) −+ 15 9 35 3 . ± . ± ij P7.26 (a) 60.0 J; (b) 60.0 J (c) 318 707 . ± . ± ms 2 ; P7.28 (a) 194 . m s; (b) 335 . m s; (c) 387 m s (d)
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