1. what would cause a wave to travel at a different speed?

adding more energy

going from a gas to a liquid

having a further distance to travel

2. sound waves are examples of?

transverse waves

longitudinal waves

surface waves

electromagnetic waves

3. parallel and perpendicular wave motion can combine to form

transverse waves

longitudinal waves

surface waves

electromagnetic waves

4. 1 pt
electromagnetic waves are examples of?

transverse waves

longitudinal waves

surface waves

mechanical waves

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.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in