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physics

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A cup of coffee (with lid) is enclosed in an insulated cup 0.5 cm thick in the shape of a cube 9.7 cm on a side. The thermal conductivity of the cup is 0.0002 cal/s x cm x C. The temperature of the coffee is 71 degrees Celsius and the temperature of the surroundings is 25 degrees Celsius. Find the heat loss due to conduction in J/s.
I did it like this:
[0.0002 (6x9.7^2)(71-25)]/0.5 = 10.388
but it was wrong.

  • physics -

    Where did you convert calories to Joules?

  • physics -

    it's true but ur answer is in cal you need to multiply it by 4.18 to convert it to joul

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