Derive an expression for the pressure distribution in a steep channel in terms of channel slope Θ and vertical distance ΔG from the free surface. The flow in the channel is uniform. Determine the precentage error in pressure for a channel slope of 0.01 if the pressure is assumed equal to γΔG

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk