00:01
We are asked to figure out how many revolutions per minute a bicycle tire that has a 26 inch diameter is going to make if somebody is going 10 miles per hour.
00:14
So i'm going to take 26 inches and multiply it by pie because that's the distance of one revolution.
00:20
It's the circumference basically of the wheel.
00:23
Okay, so we're going to call that c.
00:25
If i do that, i get 81 .60.
00:33
I'm not 20 inches one revolution now i have to figure out, okay, if i'm going 10 miles an hour, how many inches am i traveling in an hour? so there's a couple of conversions to do.
00:47
I'm actually going to do them together.
00:50
I'm going to change the hours into minutes.
00:53
Okay? and there's 60 minutes in an hour.
00:56
So i'm going to put that here, and then you'll notice the hours cancel out.
01:01
So i want to do that.
01:02
And then there's a whole bunch of inches in a mile...