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derivas con respecto al tiempo
dv/dt= 1/3\pi ( h^{2}(-1(dh/dt))+ (3r-h)2h(dh/dt))
ahora tienes estos datos
dv/dt= 0.02/3
h=1.25
r=5
necesitas dh/dt_?
dv/dt= 1/3\pi ( h^{2}(-1(dh/dt))+ (3r-h)2h(dh/dt))
0.0067=1/3\pi ( 1.25^{2}(-dh/dt)+(15-1.25)*dh/dt)
0.0067=1.047(1.5625(-dh/dt)+(13.75)dh/dt)
0.0067=1.047(-1.5625dh/dt+13.75dh/dt)
0.0067= 1.047(12.1875dh/dt)
0.0067=12.7603125dh/dt
0.0067/12.7603125 = dh/dt
dh/dt=5.25*10^-4 m
dh/dt= 0.52 mm/s crece a una tasa de 0.52mm/s