math
posted by emma .
Assuming that a table saw blade has a diameter of 12 inches and spins at 3450 revolutions per minute (RPMs),determine how fast the tip of the teeth of the saw blade are traveling in miles per hour.
Answer:
3450/12= 287.5 RPMs
287.5 min/60 mins = 1 hr
=4.8 RP/HR

Circumference = πd = 3.14 * 12 = 37.68 inches for tip to travel one revolution
one mile = 63,360 inches
The question is not how many revolutions but how fast the tips of the teeth are going.