291_Physics ProblemsTechnical Physics

# 291_Physics ProblemsTechnical Physics - Chapter 10 Section...

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Chapter 10 293 Section 10.4 Rotational Energy P10.20 m 1 400 = . k g , ry 11 300 == m ; m 2 200 = k g , 22 m ; m 3 = k g , 33 m ; ω = . rad s about the x -axis (a) Im rm r x =++ 2 2 2 I KI x Rx =++= = 4 00 3 00 2 00 2 00 3 00 4 00 92 0 1 2 1 2 92 0 2 00 184 222 2 2 .. . a f a f a f af kg m J 2 FIG. P10.20 (b) vr 300200 600 = . a f ms Km v 1 2 2 1 2 1 2 4 00 6 00 72 0 = . a fa f J 200200 = . a f v 2 2 2 1 2 1 2 2 00 4 00 16 0 = . a fa f J 400 200 800 = . a f v 3 2 2 1 2 1 2 3 00 8 00 96 0 = . a fa f J KK K K I x + + = = 123 2 72 0 16 0 96 0 184 1 2 ... J P10.21 (a) r jj j = 2 In this case, rrrr r I 1234 2 3 00 2 00 13 0 13 0 3 00 2 00 2 00 4 00 143 === =+ = = +++ =⋅ . . . . m m m k g kg m 2 (b) R 1 2 1 2 143 6 00 2 2 kg m rad s 2 ej bg . 257 10 3 J x (m) y (m)
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