The upper surface of a 50-cm-thick solid plate (k = 237 w/m·k) is being cooled by water with temperature of 20°c. the upper and lower surfaces of the solid plate maintained at constant temperatures of 60°c and 120°c, respectively. given: the thermal conductivity of the solid plate is given as k = 237 w/m∙k. determine the water convection heat transfer coefficient and the water temperature gradient at the upper plate surface.