Which of the following is not true about manufacturing employment in the U. S? Select one:
a. The number of people employed in the sector has dropped in the last ten years.

b. The number of people employed in the sector has risen dramatically.

c. Manufacturing jobs today require higher skills than in the past.

d. There is a high demand for skilled manufacturing workers.

Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air