You have two rocks made of the same material that are at the same temperature. The first rock has three times the mass of the second rock. How does the thermal energy of the two rocks compare? A. The rocks have the same amount of thermal energy.

B. The second rock has one-third as much thermal energy as the first rock.

C. The first rock has six times the thermal energy of the second rock.

D. The second rock has three times the thermal energy of the first rock SUBMIT​

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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*