Wednesday

April 16, 2014

April 16, 2014

Posted by **Fred** on Sunday, May 10, 2009 at 5:46pm.

(a) Assuming that all the heat generated by the resistor is absorbed by the solid substance, and that it takes 4 minutes to raise the temperature from -10 to 50 degrees C, calculate the specific heat for the substance.

(b) At 50 degrees C, the substance begins to melt. The heat of fusion is 4.5 x 10^5 joules per kilogram. How long after the temperature reaches 50 degrees C will it take for all of the substance to melt?

- Physics -
**drwls**, Sunday, May 10, 2009 at 6:02pm(a) Calculate the rate of heat transfer to the substance using

P = V^2/R. Multiply by 240 seonds for the number of Joules.

That energy divided by the mass and 60 C is the specific heat

(b) time required =

(Mass)(Heat of fusion)/(Power)

We will be happy to check your work

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