An existing levee has a top width of 10 feet, a top ele- vation of 10 feet above the base, and 3: 1 (horizontal: vertical) slopes on both sides. if the levee is to be raised to an ele- vation of 15 feet and must meet new standards requiring a 12-foot top width, how much additional land space (in ft2) will be needed for the base of the levee per mile of levee length? assume side slopes remain 3: 1. show all work, and support your answer with appropriate drawings and schematics

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these