206_Physics ProblemsTechnical Physics

206_Physics ProblemsTechnical Physics - 208 Energy and...

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208 Energy and Energy Transfer *P7.56 (a) W F dx k x dx k x x x k x x x i f x xx ia i a a i i 11 1 1 1 2 1 2 1 2 1 1 1 1 2 1 2 2 == = + = + zz + bg ej (b) Wk x d x k x x x k x x x x i a a i i 22 2 2 2 2 2 2 2 2 2 2 1 2 1 2 2 + = −+ z (c) Before the horizontal force is applied, the springs exert equal forces: kx ii = x k i i 2 2 = (d) W W kxx k kk x aa i i a i a i a 12 1 2 2 2 1 2 2 2 112 2 2 1 2 1 2 1 2 1 2 1 2 += + + =++ =+ *P7.57 (a) va d t t t t d t ttt tt t + =−+ = + 0 23 0 234 0 116 021 024 2 3 4 058 007 006 .. . ... . . . At t = 0, v i = 0. At t = 25 . s , v KWK Wm v f if f =−+= = = × 488 0 1 2 1 2 1160 4 88 1 38 10 2 2 4 . ms s s s kg m s J 345 af (b) At t = s , a =− + = 2 5 2 5 0 240 2 5 5 34 . . . . s 0 .210 s s 34 5 2 e j a f a f . Through the axles the wheels exert on the chassis force Fm a = × 5 34
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