Question

Help please.
A certain computer hard drive contains a circular disk with diameter 4.5 inches and spins at a rate of 7100 RPM (revolutions per minute). Find the linear speed of a point on the edge of the disk in miles per hour.

Answer 1

start with findig the perimeter of the disk

Answer 2

angular speed: \(\omega=\)convert rpm to rad per sec
linear speed : \(v=\omega r\)

Answer 3

whats the deal with finding the perimeter ? :O

Answer 4

I have no idea how to do this

Answer 5

If we want to know how many miles per hour it is moving we need to find how many miles it moves in an hour. So since they told us how many revolutions it makes in 1 minute we could find how far it moves in each minute if we just knew how far it moves in 1 revolution. Do you understand that?

Answer 6

have you studies the uniform circular motion in physics 1?