Toughness, hardness at high temperatures, and wear resistance is required for a crankshaft. which steel would you select? (a)- sae 1302 (b)-sae 1017 (c)-sae 4042 (d)-sae 2057 (e)-sae 4309 (f)-sae 3113

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux