1. The problem statement, all variables and given/known data A metal (doesn't say what metal) is in a heater that is set to 700 K. If the temperature of the ball is 900 K then the rate of heat loss = 0.10 J/min. What is the rate of heat loss when the ball's temperature = 800 K. The ball's emissivity doesn't change appreciably with temperature. 2. Relevant equations Q = emissivity * Boltzman Law * Temperature (to the 4th power in K) * Area * time 3. The attempt at a solution I solved for A using the given information then plugged it in to the equation above to solve for Q/t using 800 K instead of the 900 K. My answer doesn't check out. Am I suppose to convert 0.10 J/min into J/seconds? If so, how?