Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius of the artery from 10.0 mm to 7.22 mm. To maintain identical blood flow, by what numerical factor does the pressure differential provided by the heart increase compared to a normal artery (no fatty tissue build-up)?

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).