Ship a is located 3.90 km north and 2.50 km east of ship b. ship a has a velocity of 21.0 km/h toward the south and ship b has a velocity of 40.0 km/h in a direction 37.0° north of east. what are the (a) x-component and (b) y-component of the velocity of a relative to b? (axis directions are determined by the unit vectors i and j, where i is toward the east.) (c) at what time is the separation between the ships least? (d) what is that least separation?

In what direction does the medium move relative to the direction of the wave? explain.

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.

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s