The yield strength for an alloy that has an average grain diameter of 5.9 × 10-2 mm is 128 MPa. At a grain diameter of 6.6 × 10-3 mm, the yield strength increases to 268 MPa. At what grain diameter, in mm, will the yield strength be 236 MPa?

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