Question

One face of an aluminium cube of edge 2 metre is maintained at 100 °C and the other end is maintained at
0 °C. All other surfaces are covered by adiabatic walls. Find the amount of heat flowing through the cube in
5 seconds. (thermal conductivity of aluminium is 209 W/m=°C)​

Answer 1

Answer:

Heat will flow from the end at 100

∘

C to the end at 0

∘

C.

Area of cross-section perpendicular to direction of heat flow,

A=4m

2

then

t

Q

=KA

L

(T

H

−T

c

)

Q=

2m

(209W/m

∘

C)(4m

2

)(100

∘

C−0

∘

)(5sec)

=209KJ