A spinter in 100 m race, covers 4m in first section 30m in next y sec 52 m in another 4 sec and finishes the race 10 sec. Then find : 1) Average velocity of a spinter
2)What is the peak velocity attend the
spinter
3)During which time interval is the e
laccelerating highest ?

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*