Acarton of 12 rechargable batteries contains one that is defective. in how many ways can the inspector choose 3 of the batteries and (a) get the one that is defective, (b)not get the one that is defective?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

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*

Elements on the periodic table are ordered according to their