A solid 0.125 in. diameter steel [E = 30,000 ksi; α = 6.5 × 10−6/°F] wire is stretched between fixed supports so that it is under an initial tensile force of 40 lb. If the temperature of the wire drops by 75°F, what is the tensile stress in the wire?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon

Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*