A cylindrical workpart with diameter 2.5 and height 2.5 in is upset forget in an open doe to a height 1.5 in, Coefificent of friction at the die work interface =0.10. The work material has a flow curve defuined by K = 40,000 lb/in.2 and n = 0.15. Determine the instantaneous force in the operation (a) just as the yield point is reached (yield strain = 0.002), and at a height (b) h = 1.8 in.

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

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling