math  please help
posted by Sushmitha on .
The 7 inch diameter drive drum of a belt conveyor is turning at 130 rpm.
What is the belt speed (ft/min) if there is no slip between the belt and drum?

1 revolution per minute = 2r pi [ in ] / min
r = radius
130 revolutions per minute = 130 * 2 * r * pi = 260 * r * pi [ in / min ]
In this case r = 7 / 2 = 3.5 in
Velocity = 260 * 3.5 * pi = 2858.8493 in / min
1 ft = 12 in
Velocity = 285.8493 / 12 =
238.23744166 ft / min