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## Moment siły i moment pędu

All right so these are the variables that are involved. And so you can keep goin’ through, wherever you had an x, that was the regular position, you’d replace it with theta, the angular position.

And should this be alpha be positive or negative? kinematykka

You ended up with seconds squared on the top. So I’ll replace all these x’s with thetas. And if you solve all this for t, I get that the time ended up taking about 1. If this bar would have slowed down, we’d of had to make sure that this alpha has the opposite sign as our angular velocity.

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That would give us 20 pi. So we’ve got our angular displacement, what else do we know? So omega final is not involved here at all.

### Opracowania do zajęć wyrównawczych z matematyki elementarnej

And now we can solve. All right, this one we’re gonna have to actually use a kinematic formula for. So that answers part a, we got how fast in meters per second. So there’s no such thing as angular time or linear time. You always need a third known to use a kinematic formula. They have to all be in the same unit. So it’s gonna be 20 revolution times two pi radians per revolution.

These are the rotational kinematic formulas.

### Rzut ukośny (fizyka) – Wikipedia, wolna encyklopedia

And then it’s gonna be plus two times alpha. So you can write one over second squared if you wanted to. This third one has no omega final, so I’m gonna use that one. Instead of acceleration, I’d have the angular acceleration.

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## Rzut ukośny (fizyka)

Set it revolved 20 revolutions. So let’s right those down. So now we just solve this algebraically for time. Let’s do another one.

Let’s check this one out. We don’t know alpha, but that’s what we wanna find, so I’m gonna leave that as a variable. We’ve got a formula that relates the speed to the angular speed. But zero squared is still zero, equals omega initial squared. So I’ll look through ’em. And then delta theta we know. The way I figure out what kinematic formula to use is that I just ask which variable’s left out of all these? So since we called this positive 10 pi radians and the object sped up, we’re gonna call this positive 30 radians per second squared. So that’s what we can say down here.