Estimate the pore diffusivity, the membrane diffusivity, and the effective diffusivity of a spherically shaped molecule with a molecular weight equal to 35,000 through a membrane containing straight cylindrical pores that are 8 nm in diameter. Assume that the molecule enters the pores of the membrane from a well-stirred bulk solution and that the porosity of the membrane is 0.40

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?