Posted by Isabell on .
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)(7125)]/0.5 = 10.388
but it was wrong.

physics 
bobpursley,
Where did you convert calories to Joules?

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