- #1
lolcat
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Homework Statement
Suppose a cup of boiling water (m=250g) instantaneously cools to room temperature (25°C) with the liberated thermal energy going into translational KE. How fast will the cup fly off the table? Assume the water molecules have 18 degrees of freedom.
Homework Equations
Q=mcΔT
Uwater=9nRT (not sure about this one)
The Attempt at a Solution
So what I first did was try to calculate Q:
Q=mcΔT
Q=(250g)(1)(25-100)
Q=-18750 cal
I then converted calories to joules:
-18750 cal x 4.186 J = -78487.5 J.
I am not sure where to go after this. Any help?