A2-in. diameter horizontal shaft is supported by two sleeves, each of length = 2 in. the internal diameter of the sleeves is 2.1 in. the radial space between the shaft and the sleeves is filled with an oil of viscosity = 8x10 needed to move the shaft at a velocity of 1 fus. lb-s/ft'. what is the force

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