Answer:
Explanation:
From the information given,
diameter = 7 inches
We would convert 7 inches to feet. Recall,
12 inches = 1 foot
7 inches = 7/12 foot
diameter = 7/12
The formula for calculating circumference of a circle is
circumference = π x diameter
π = 3.14
thus,
circumference = 3.14 x 7/12 = 21.98/12
Surface speed = circumference in feet x rpm
rpm = 1200
By substituting these values into the formula,
Surface speed = 21.98/12 x 1200
Surface speed = 2198 ft/min
