Hw7.4. a copper sphere of a diameter 5 cm at 177c is cooled by an air stream at 27c, as described below. the air stream velocity is 0.5 m/s at 1 atm. calculate (a) the average rate of heat convection over the entire surface of the sphere and (b) the rate of heat convection into the air stream

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

What are the major differences between injection molding and extrusion?

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers