Consider the boundary layer next to the smooth hull of a ship. The ship is cruising at a speed of 45 ft/s in 60 o F fresh water. Assuming that the boundary layer on the ship hull develops the same as on a flat plate, determine: (a) The thickness of the boundary layer at a distance x = 100 ft downstream from the bow. (b) The shear stress, 0, adjacent to the hull at x = 100 ft.

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