- #1
Karol
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- 22
Homework Statement
A bucket with surface A, full of water, is pulled upwards through humid air, humidity ρ[mass/unit volume], at constant speed v0. the cloud is at rest and the drops instantly stop at hitting the water.
Homework Equations
Newton's second law: ##F=\frac{d(ma)}{dt}=\dot m v+m\dot v##
The Attempt at a Solution
The bucket that collects water isn't an isolated system, so:
$$F=\dot m v_0+\dot v m+\Delta P=\dot m v_0+0+\rho A v_0^2=2\rho A v_0^2$$