Oxygen is diffusing through a staganant layer of methane 5 mm thick. The temperature is 0o C and the
pressure of 1 atmosphere. Calculate the rate of diffusion of oxygen in kilograms per hour through 1 m2
of methane film when the concentration change across the film is 15% to 5% oxygen by volume. The
value of diffusivity may be taken as 0.184 cm2
/s. R = 82.06 cm3
atm/ g mol K.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

Burgers vector is generally parallel to the dislocation line. a)-true b)-false