During a trial run, race car a starts from rest and accelerates uniformly along a straight level track for a particular interval of time. race car b also starts from rest and accelerates at the same rate, but for twice the time. at the end of their respective acceleration periods, which of the following statements is true? car a has traveled a greater distance. car b has traveled twice as far as a. car b has traveled four times as far as car a. both cars have traveled the same distance.

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*