Okay, so most of you saying that the torque vector points toward you, toward you would be a counterclockwise torque. Now, I meant that to be essentially the same as this picture here. Here's a force down at the bottom. I'm pushing to the right. The point of the axis of rotation is up above where I'm pushing it. So I meant that to be almost exactly the same picture except with something that's not round. So with a goblet. And so I meant it to be the same answer. And I meant it to be a torque vector pointing toward you counterclockwise rotation. So the question is, is that true? I mean, if I want to make this thing, first of all, I want to show you that there's a force pulling it to the right. So I'll just pull on it slowly and you'll see that there's no momentum and then suddenly it acquires a momentum to your right. So that happened because I put on a force to the right. So the friction force is pointing to your right. What if I put on this friction force quickly? Will it rotate counterclockwise if I do it just right? And the answer is it does. If I pull like this, it rotates like that. It rotates counterclockwise because I put on a counterclockwise torque. So it does that. Of course, there's always the, I don't know, I probably can do the... You can always pull it out fast enough that you can see it's still wobbled. So you can pull it out fast enough that it doesn't rotate this as far as this. This is what it needs to rotate before it's going to finish. If it rotates not as far as this, then I already have it out, then it'll just wobble and stay still. If I pull it out quick enough, it just wobbles a tiny bit and you don't even notice it and you think everything stayed exactly the same and nothing changed at all. And it was a wondrous magic trick. But in fact, everything moved a tiny bit. Any questions about that one? It was supposed to be B. So this is about... I got three quick questions. Uniform plank shown to the right has a mass L. Sorry, a length L. The whole length of this is L. It has a mass M. So this plank itself has a mass M. It's like this thing. This way is something. So it has a mass. There's a full-crump. In fact, it's exactly like this. There's a full-crump that's one quarter of the way from one end. It's a uniform plank, by the way. So where's the center of mass of this plank? Exactly at the center of the plank, right here. In fact, why does this thing fall like that? What's the direction of the force by the earth? Straight down here. What's the direction of the torque that that causes? Around this axis over here to the left. Direction of the torque. Toward me or toward you? How many say toward me? How many say toward you? So I can let go and we'll see what it does. Not a whole lot, but clearly it wasn't rotating. And then the force by the earth caused it to rotate clockwise. Clockwise right hand rule is toward me, away from you. So most of you got it right. This question is simpler than that. This question, where should the downward force, F by string on plank, be placed? So I'm going to draw the plank. I'm going to draw a bunch of forces. I'm going to put a downward force. And my question for you is where should I put that downward force?