Helium and nitrogen gas are contained in a conduit 5 mm in diameter and 0.1 m long at 298 k with a uniform constant pressure of 1.0 atm. the partial pressure of he at one end of the tube is 0.06 atm and at the other end it is 0.02 atm. the diffusivity of he in n2 is 0.687 x 10-4 m2 /s. assuming steady state in the conduit, calculate the following: a. flux of he in the conduit b. mass transfer rate of n2 in the conduit c. partial pressure of he at 0.05 m from either end

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.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false