Q. A styrofoam cooler (k = 0.030 W/(m·K)) has outside dimensions of 0.270 m by 0.230 m by 0.280 m, and an average thickness of 2.6 cm. About how long will it take for 1.60 kg of ice at 0 °C to melt in the cooler if the outside temperature is 30.0 °C?
Q. A 2.50 kg grinding wheel is in the form of a solid cylinder of radius 0.200 m. What constant torque will bring it from rest to an angular speed of 1400 rev/min in 2.60 s?