1. What is the pitch diameter of a 40-tooth spur gear having a circular pitch of 1.5708 in? 2. How many revolutions per minute is a spur gear turning at if it has 28 teeth, a circular pitch of 0.7854...

1. What is the pitch diameter of a 40-tooth spur gear having a circular pitch of 1.5708 in?

2. How many revolutions per minute is a spur gear turning at if it has 28 teeth, a circular pitch of 0.7854 in, and a pitch-line velocity of 12 ft/s?