A person jumps from a fourth-story window 15.0m above a firefighters safety net. The survivor stretches the net 1.0m before coming to rest. What was the average deceleration experienced by the survivor when she was slower to rest by the net? What would you do to make it “safer” (that is to generate a smaller deceleration): would you stiffen or loosen the net? Explain.

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*