A 1-in-diameter solid shaft has a groove 0.1-in deep with a 0.1-in radius machined into it. The shaft is made of AISI 1020 CD steel and is subjected to a purely reversing torque of 1800 lbs. in. Estimate the number of cycles to failure. Assume Sut

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