00:01
A truck with 18 to inch diameter wheels.
00:03
So i'm going to stop here and put my diameter is 18 inches, but i'm also going to say my radius is 9 inches.
00:10
It's traveling at 55 miles per hour.
00:14
So it's 55 miles per hour.
00:18
How many revolutions per minute do the wheels make? so we want to know our angular velocity.
00:25
So we know that v equals r omega.
00:28
Or omega is going to be v divided by r.
00:32
So we're looking for my velocity, which is 55 miles per hour, divided by my radius, so i'm going to put that one over nine inches.
00:46
Now what does it want? it wants it in revolutions per minute and radians per minute.
00:52
Okay, so let's look, we have two different units to deal with.
00:55
Let's, both of these don't involve hours.
00:58
So let's eliminate our hours.
01:00
We know that one hour is 60 minutes.
01:04
So we have hours eliminated...