Homework Help: Physics

Posted by sophie on Friday, April 3, 2009 at 2:34pm.

The melting point of a solid is 90.0 degrees C. What is the heat required to change 2.5 of this solid at 40.0 degrees C to a liquid? The specific heat of the solid is 390 J/kg (K) and its heat of fusion is 4000 J/kg.

A. 4.9 10^4 J
B. 1.0 10^4 J
C. 5.9 10^4 J
D. 5.0 10^4 J

I am leaning towards C, but I need help understanding the process a bit more thoroughly. Thanks!

Physics - drwls, Friday, April 3, 2009 at 6:04pm
I assume that the amount to be melted is 2.5 kg. If you start out at the melting point (40 C), the energy reguired is 4000 J/kg x 2.5 kg = ?
Physics - Anonymous, Friday, April 3, 2009 at 7:04pm
Yes kg.
So the answer is B?
Physics - drwls, Saturday, April 4, 2009 at 12:36am
yes

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