Pressurized steam at 540 k flows through a long, thin-walled pipe of 0.6-m diameter. the pipe is enclosed in a concrete casing that is of square cross section and 2 m on a side. the axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 300 k. what is the heat loss per unit length of pipe?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.