B=105 , D= 15

1. a. B kg of water at 50 C is poured into a bucket that contains D kg of ice at 0 C. Find the equilibrium temperature (neglect the influence of the bucket)? (40 points) b. What is the rate of heat transfer by radiation if a hot tea pot in 100 C sits outside in temperature B/5 "C. Take the surface area of the pot as B/10 m. The emissivity of pot is D/20 in the infrared, where the radiation takes place. Stephan Boltzmann constant 5.67 x 10-8 W/m K*(35 points)