How Does Copper's Thermal Conductivity Affect Heat Transfer?

[tag16]

Homework Statement

A copper bar of thermal conductivity 401 W/(m·K) has one end at 102°C and the other end at 23°C. The length of the bar is 0.10 m and the cross sectional area is 1.0 multiplied by 10-6 m2.
(a) What is the rate of heat conduction along the bar?

(b) What is the temperature gradient in the bar?

(c) If two such bars were placed in series (end to end) between the same temperature baths, what would script p be?

(d) If two such bars were placed in parallel (side by side) with the ends in the same temperature baths, what would script p be?

(e) In the series case, what is the temperature at the junction where the bars meet?

Homework Equations

P=KA(deltaT/d)

The Attempt at a Solution

I'm stuck on part (a). I used the above equation and got: (401)(1x10^-6)(102+23/.1)=.50125 which is apparently wrong.

 

[Dadface]

Did you plug in the correct value for delta T?Delta T should be the temperature difference.

 

[tag16]

opps...yeah that was suppose to be a negative sign. Thanks