送交者: gyro 于 2010-02-04, 12:43:46:
回答: coubert, 你没有证明漏水时间减少 由 gyro 于 2010-02-04, 12:22:21:
dV/dt=-f(v).
The time it takes to drain the water is
T=\int dV/f(V), integrated from V=0 to V=V0.
In the two considered cases, f(V) with the wood is greater than f(V) without the wood, at any V. So the time with the wood is smaller.