Ahot pipe 10.16 cm od and 50. long passes through a 40 c engines room. the temperature of the pipe surface is close to 150c. the pipe has a leyer of 2.45cm thick of polyurethane foam (kf=0.04w/m-k), and a protecting 2mm thick clean polished aluminium foil (kf=204.2 w/m-k, e=0). the heat transfer coefficient by convection to the air is 10 w/m2-k:

a) what is the total heat rate loss?

b) what is the temperature of the external aluminium surface?

Which best represents the law of conservation of mass ?

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states