A toll plaza is capable of serving cars at a constant rate of μ cars/hr. Cars arrive at a constant rate 휆휆1<μ until some time 푡푡=0 (e. g. 7:00 am), but from 푡푡=0 until some time 휏휏, they arrive at a rate 휆휆2>μ (where 휆휆1 and 휆휆2 are in units of cars/hr). After time 휏휏, the arrival rate returns to the value 휆휆1 and remains there until time 휏휏′ (e. g. 7:00 am the next day) when the pattern repeats itself. Vehicles note served immediately form a queue and are served first-in, first-out. The queue present at time휏휏 vanishes by time 휏휏′.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.