Rate of change dV/dt I have the following task: "Poiscuille's Law: V=P/4Lupsilon(R^2−r^2). Assume that r is a constant as well as P,L,upsilon. Find the rate of change dV/dt in terms of R and dR/dt when L=1mm, p=100, upsilon=0.05." I cannot understand how can how can diff that, what is the t here? I can write V=500(R^2−r^2). But what after? And what is "find the rate of change in terms of...? Something like: dV/dt=dVdR/dRdt?

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