Two spur gears in mesh are designated as a and b. gear a has 40 teeth of 4 inch-i diamteral pitch. gear b has a pitch circle diameter of 16 inches. determine. i. the number of teeth on gear b ii. the circular pitch. iii. the centre -to centre distance between the gears.

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.