Mr. Harden's class decides to perform an experiment to determine how long it takes different objects to hit the floor when dropped from a desk. The class dropped three balls from a desk, one weighing 2 pounds, one weighing 4 pounds, and one weighing six pounds. It took them all the same amount of time to hit the floor. After evaluating these results, you predict that a 10 pound ball will take

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*