Recent content by Gurdian

Ah that's what the explanation was talking about.

Not homework just my own revision. If sin a = –cos b = 3/5 and a and b are both in the second quadrant, what is cos (a – b)? Now keep getting the answer 0, but the answer is apparently 24/25, now they use the trig subtraction formula, I just did cos ((arcsin(3/5) - arccos(-3/5)) I got 0 as...

Ok that's what I thought. Thanks for clearing things up.

One last question if I had a uniform line of atoms bonded and I applied a force at one end cold you go through how that line of atoms bonded would respond so that a rotation would occur. Everything should be cleared up after that.

So torque is just the capacity to cause rotation? I thought it meant that rotation of the object was made easier. May I ask a question. Why is it that if I have a light plank on a seesaw and I put a particle on either side of the pivot, each of equal mass, the particle that is farthest...

You pull the lever with a small amount of force but the torque generated is large because of the distance from the pivot, and that large torque is used to rotate something smaller that would have required a large forcec to turn?

Right I understand the moment of inertia now, and why things rotate (to the level that is necessary for me to continue reading) what I don't understand is why the torque is larger for a greater distance from the pivot, is it that a larger torque is required for a given magnitude of angular...

But I don't understand, that's what I thought until I read that the larger the distance the less force required for amoment of equal magnitude. Why is it easier to achieve the same rotation if you apply the force further away from the pivot? Or is it a case of for any given force (change...

Right I see, and for torque whe torque increases with distance from the center, what does that mean and why does it happen? Are more molecules pulling I the direction of rotation when r is larger? I really don't understand the moment of inertia and where it comes from.

I didn't think of using a simple molecule to illustrate it, just large systems. So when I push one atom it accelerates during the application of the force, all the while attraction of the other atom opposes this by pulling the break away atom toward it and due to N.3rd the break away molecule...

Someone derived the equation for moment of inertia using KE but it didn't look right it was [integrate] r^2 dm where m is mass, that didn't look right to me because I thought "I" was r^2*m. Any I took a look at the threead suggeted as well as the explanations and they were too elaborate as I...

That does sound ugly, I'll check out that thread thanks.

Sorry by n1, 2 and 3 I meant Newtons three laws of motion. By magnitude of rotation I meant moment, understanding why the mokent increases would be great Kinetic energy is stored in rotation? Like some sort of stationary wave or something? Is orbiting a kind of rotation? Thanks but I...

Just from the most basic concepts, is it due because of rigidity that when a force is applied to a non COM point that an object rotates? Why does the magnitude of rotation increase with increased perpendicular distance from the pivot or COM point. Also do you transfer more KE to an object...

sorry I thought it was a frictionless surface.