The diffusivity of human insulin is 77 µm2 /s in water at 37◦ C. Assuming the protein to be spherical, what is its effective radius? How does this compare to its crystal structure dimensions (77.22 x 77.22 x 77.22 Å)? Hint: The mean frictional drag coefficient for a sphere of radius R = 6πµR

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?