T = T 2 1 2 2 r r 3 1 3 2 GMm F = 2 r
B = ρgv
3Wl = Ybh 3 C y( x) = ρg ρgx cosh C ρgl 2C ρgl cosh 2C
PV γ =
1 1 + p q = 1 f
- +
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