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218_Physics ProblemsTechnical Physics

218_Physics ProblemsTechnical Physics - 220 P8.5 Potential...

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220 Potential Energy P8.5 UKU K ii f f += + : mgh mg R mv += + 02 1 2 2 a f gR g Rv 350 2 1 2 2 . a f a f =+ vg R = 300 . Fm v R = 2 : nm gm v R 2 v R gR R g n =− L N M O Q P L N M O Q P = = 2 3 200 2 00 5 00 10 9 80 00980 . . .. . . kg m s N downward 2 ej e j FIG. P8.5 P8.6 From leaving ground to the highest point, KUK U f f 1 2 600 0 0 980 2 mm y ms 2 bg +=+ The mass makes no difference: ∴= = y 298 0 184 2 . . . ±ms m 2 af *P8.7 (a) 1 2 1 2 1 2 1 2 22 mv kx mv kx ff + 0 1 2 10 0 18 1 2 015 0 018 10 1 147 2 2 +− = + = F H G I K J F H G I K J = Nm m kg m N 0.15 kg m kg m 1 N s 2 v v f f (b) KU K U is i fs f 0 1 2 10 0 18 1 2 1 2 10
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