Recent content by HalfThere

I was able to figure out the second problem from your advice, but the first problem still eluded me. I probably should have just brute-forced it with energy, but it would have looked ridiculous. Ah well. Thanks.

Yes, A is the acceleration downwards of the center of mass of the cylinder. On the first, how do you get your equations? If A = g - T/M - a (not alpha), then A + a = 2g - T(m+M)/(mM) = \alphaR, which can't be the case either, as it doesn't factor in moment of inertia at all, and gives you a...

At least, they're difficult for me. I find them very hard to set up, in particular the interaction of the rotation and translation is hard for me to grasp. I've worked on both of these very hard, with only some headway, so be liberal in your help. (For some reason, all my greek letters are...

F = ma is key. And there IS another a apart from gravity. Hmmm, what could be accelerating in the problem?

Remember that the Earth's angular momentum is conserved through its orbit. L = mvr And consider that, since the Earth's new velocity is in the same direction as before, it would go back to R for its semi-minor axis, due to the fact that the new velocity is in a single coordinate only, and it...

Can anyone answer the third post of the topic, where I ask about conservation of momentum V. conservation of energy in the case of the rocket?

The thing is, there's no such thing as a truly inelastic material. The example you gave can be used to figure out the minimum elasticity for any substance in the universe (which is still extraordinarily low, far beyond any actual known material). Case C is the actual answer.

Ah, you're indeed right. I see now. And it makes sense if you look at units too. Okay, Thanks learningphysics!

I see where I went wrong with the 2^(-1/6), it should just be 3^(1/3) for the constant, but I still don't see the problem with the M. It was transformed from M to M^(2/3), then square rooted to M^(1/3), which was over M, which is M^(-2/3).

Which specific step does the miscalculation occur? I can't quite see what you mean. Also, a more general question about energy: What will a constant power input do to something with a velocity with no immediate context, like a rocket in space? On the one hand, I think acceleration should...

Homework Statement An object of mass M begins with a velocity of 0 m/s at a point. A power input of P watts goes directly to kinetic energy until the object has traveled a distance of X meters. What is the final velocity of the object? So, we have constant variables M = mass X = distance...

I'm a bit new to the forums, so I didn't realize there was this homework board. Thanks for showing it to me. Here's a more detailed description: An elevator falls from a height of 15 m onto a three springs of 3 m, 2 m, and 1.5 m long respectively, and k, 2k, and 4k tension respectively...

A teacher of mine assigned an extra credit problem. It involves an object falling onto some springs, and we're assigned to find highest velocity and highest acceleration. I can do that easily. However, he said that it would be double extra credit to create a circuit analogue to the problem. I'm...

The semiconductor, which forms the basis of all modern computing. From the internet to the iPod, it's at the heart of the current technological paradigm.

I've had three boomilevers so far. The first was unevenly made, but mainly broke because the attachment base was, to say the least, lacking. The second was way too heavy for various reasons, but ostensibly held 13 kilograms (I think it was being aided with the bucket resting on the device that...