The circular blade on a saw has a diameter of 7.5 inches and rotates at 2400 revolutions per minute.

1 answer:

4 0

For a:

(2400*2*PI)/60(seconds) = 80 PI RAD/Sec

For b:

arc length s= radius r * central angle(in radians)

= ((80*pi*7.5)/(2*pi)
=25

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