A small oven has a surface area of 0.20 m^2. The insulated walls are 1.5 cm thick with an average thermal conductivity of .040 W/m.C. What is the rate of heat loss if the temperature inside the oven is maintained at 245 deg C and outside temperature is 20 deg C?
2006-08-09 03:40:35 · 2 answers · asked by Lou 1 in Science & Mathematics ➔ Physics
a. 120 W
b. 80.0 W
c. 200 W
d. 1200 W
2006-08-09 03:52:24 · update #1
You just need to look up the equation for conductive heat flow. Plug in your numbers, and be sure to track the units.
How did you calculate all those different answers (the 120, 80, 200, and 1200 Watts)?
2006-08-09 13:36:40 · answer #1 · answered by genericman1998 5 · 0⤊ 0⤋
q = .04x0.2x(245-20)x100/1.5 = 8x225/15 = 120 J/s
Only one face of the oven is considered.
2006-08-09 03:55:21 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋