Which of the following are correct statements? Check all that apply. O A. The atomic number is the number of electrons an atom has. 07 B. Atoms are the basic units of matter. I C. The number of protons in an atom's nucleus defines what kind of atom it is. D. The number of neutrons an atom has defines what kind of element it is

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*