Homework Help: physics

Posted by Serena on Tuesday, February 12, 2008 at 9:16pm.

At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg. What mass of ice melts in one hour？

Can anyone please give me some hints to do this?Thanks a lot!

physics - bobpursley, Tuesday, February 12, 2008 at 9:47pm
The deltaTemp is (35-0)C.

Q=Area/Thickness*Heatconductivity*deltaTemp

For styrofoam, assume about .03Joules/(sec*m*C)

Solve for q,the amount of heat.

Now, finally a= massice*Lf
- physics - Serena, Tuesday, February 12, 2008 at 10:17pm
  Q=Area/Thickness*Heatconductivity*deltaTemp
  
  How you get this equation?
  and how you use the styrofoam=.03 J/s*m*C?

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