Adart is thrown horizontally with an initial speed of 10 m/s toward point p, the bull's-eye on a dart board. it hits at point q on the rim, vertically below p, 0.19 s later.
(a) what is the distance ?
(b) how far away from the dart board is the dart released?

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).