00:01
For this question to start off with, we know that the diameter of the wheel is 26 inches, and we also know that the wheel has 480 revolutions per minute.
00:12
So we are asked for two things.
00:16
So first of all, we are asked to figure out the road speed in miles per hour, and then we are asked to determine how many revolutions per minute should the balancer be set for a road speed of 80 miles per hour.
00:27
So next we need to determine the radius of our wheel so we know our radius is just half our diameter.
00:35
So we can say our radius is 26 over 2, which is equal to 13 inches.
00:42
So now we know that we can first figure out the speed in inches per minute and then we can change it into miles per hour.
00:51
So to start off with, we have our speed is equal to, let's see, our circumference.
01:01
Which is 2 pi times our radius, which is 13, multiplied by 480, which is equal to 12 ,480 pi inches per minute.
01:15
Now we are asked to find a speed in miles per hour, so we will take 12 ,480 pi...