00:01
Okay, so this question we want to know, we want to estimate basically the drag force if you put your hand outside of a car.
00:07
And so this is kind of an interesting problem.
00:11
So i think we can use the drag force as equal to one half row a, v squared, and then like some kind of drag coefficient.
00:22
Or just estimating.
00:23
So we know, i think from the book it said this is between 0 .5 and 1 and 2.
00:29
So let's just say that this is 0 .5.
00:34
I mean, we could say it's one.
00:36
Let's just say it's one.
00:37
We're just trying to do an estimate here.
00:40
So we're going to say the d is approximately 1.
00:43
Now let's go through.
00:45
Rowe, we know that that's the air resistance.
00:49
So that's 1 .02 kilogram.
00:52
Sorry, the air density per meter cube to not resistance.
00:55
A, what's like a cross -sectional area of your hand? like, i don't know, like maybe five centimeters, i don't know, 10 centimeters, 10 centimeters by five centimeters.
01:14
So, and then we want to convert that to meters.
01:22
So that's just going to be 0 .1 meter times 0 .05 meter...