A small copper heat sink with dimensions W1 W2 40 mm, Lb 1.0 mm, S 1.6 mm, t 0.8 mm, and Lf 5 mm has a uniform maximum temperature of Th 50°C on its bottom surface. An insulating cap is placed on the top of the heat sink. Water is used as the coolant, entering the heat sink at Tm,i 30°C and um 1.75 m/s, providing an average heat transfer coefficient of h 7590 W/m2 · K. Determine the heat transfer rate from the hot surface to the water.