Aspherical pot of coffee contains 0.50 l of liquid at an initial temperature of 80°c. the pot has an emissivity of 0.40, and the surroundings are at a temperature of 20°c. calculate the coffee’s rate of heat loss by radiation. use σ = 5.67 × 10–8 w/(m2 • k4).
a.
6.1 w
b.
4.9 w
c.
3.0 w
d.
5.6 w