ch08-p051 - 51. (a) The initial potential energy is 2 6 Ui...

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51. (a) The initial potential energy is Um g y ii == = × (520 1 kg) 9.8m s (300 m) .53 10 J 2 6 di where + y is upward and y = 0 at the bottom (so that U f = 0). (b) Since f k = μ k F N = k mg cos θ we have th cos kk Ef d m g d Δ= = from Eq. 8-31. Now, the hillside surface (of length d = 500 m) is treated as an hypotenuse of a 3-4-5 triangle, so cos = x / d where x = 400 m. Therefore,
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