Problem 2 [o 1,021 a steel tube having k = 46 w/m-c has an inside diameter of 3.0 cm and a tube wall thickness of 2 mm. a fluid flows on the inside of the tube producing a convection coefficient of 1500 w/m2-oc on the inside surface, while a second fluid flows across the outside of the tube producing a convection coefficient of 197 w/m2-oc on the outside tube surface. the inside fluid temperature is 223 c while the outside fluid temperature is 57 c. calculate the heat lost by the tube per meter of length.

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

The bohr model of the atom explained why emission spectra are discrete. it could also be used to explain the photoelectric effect. which is a correct explanation of the photoelectric effect according to the model?

How to calculate the mass of copper