推 jigfopsda:謝謝。 11/27 07:19
==> W = ∫P(V(x))dV(x) = ∫PdV #
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<Jona's Office> in anfranion 板 @ ptt2.cc
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◆ From: 122.116.50.107
W = ∫Fdx = ∫πr^2 P(V(x)) dx
V(x) = πr^2 x
d V(x) = πr^2 dx