Well I swear I am doing this right but something seems that its the wrong answer as the website I enter it into is rejecting it. If you see a flaw in my methods let me know:(adsbygoogle = window.adsbygoogle || []).push({});

The two ends of an insulated metal rod are maintained at a temperature differential of 100 degrees C . The rod has a length of 73.3 cm and a cross-sectional area of 1.06 cm^2. The heat conducted by the rod melts a mass of 7.80g of ice in a time of 11.3 min

So what I did was first find the amount of energy required to melt the ice without changing the temperature which uses Q = m*L

therefore:

[tex] .0078kg * 3.34 * 10^5 J/Kg = 2605.2 [/tex]

then I use the formula:

[tex] H = Area*k*(T_h - T_c)/L [/tex]

I need to find k for the answer in terms of W/m*k

So since H = dQ/dt I get, 2605.2/11.3 = 230.549

Using the above forumla and converting Celcius to Kelvin I have:

[tex] 230.549J/min = .000106 m^2 * k * 373.15K/.733m^2 [/tex]

which gives me approx 4270. Can anyone see where I went wrong?

Thanks

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# Homework Help: Thermal Question, I seem to be doing something wrong

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