ch08-p128 - 128. The distance traveled up the incline can...

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128. The distance traveled up the incline can be figured with Chapter 2 techniques: vv a x x 2 0 2 2 200 =+ = ΔΔ m. This corresponds to an increase in height equal to y = (200 m) sin θ = 17 m, where 5.0 . We take its initial height to be y = 0. (a) Eq. 8-24 leads to WE m v v m g y app == + Δ 1 2 2 0 2 c h . Therefore, Δ E 86 10 3 .J . (b) From the above manipulation, we see W app = 8.6 × 10 3 J. Also, from Chapter 2, we know that tv a 10 s. Thus, using Eq. 7-42, P W t avg W × = Δ 10 860 3 . where the answer has been rounded off (from the 856 value that is provided by the calculator).
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