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

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed