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Aliun [14]
3 years ago
5

The rate of change of the volume V with respect to time t of water leaking from a tank is proportional to the cube of the volume

. Which of the following is a differential equation that could describe this relationship?
Mathematics
1 answer:
GuDViN [60]3 years ago
4 0

Answer:

V = \sqrt[4]{K1*t+K2}

Step-by-step explanation:

Since:

V: volume

t: time

K: proporcional constant

dV/dt = K*V^3 ---> (V^-3)dV = Kdt

Integrating by parts: \int\limits^{V}_{Vo} V^{-3}  \, dV =K* \int\limits^{t}_{to} {t} \, dt

Then:

(-1/4)*(V^{-4} -Vo^{-4})= K*(t-to)

(-1/4)*V^{-4}= K*(t-to) + (-1/4)*Vo^{-4}

V^{-4}= (-4)*K*(t-to) +  (-4)*(-1/4)*Vo^{-4} = -4K*(t-to) + Vo^{-4}

If we call: K1 = -4K ; K2 = Vo^-4, (both constants) then:

V = \sqrt[4]{K1*(t-to)+K2}

If chose select the initial time into = 0, then:

V = \sqrt[4]{K1*t+K2}

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