Recent content by Phan

Homework Statement A cue hits the billiard ball at the position shown. The collision lasts 90 ms with an average force of 420 N. If R = 7 cm, m = 300g, k = 0.1. (ignore friction during impact) *Didn't post the rest since they are irrelevant. Homework Equations J(angular) = (x*F*t)/I...

So setting my 4th equation using the masses for force would be incorrect? Also, I did the question using only the accelerations as the 4th equation, and I think I got the right answer :)

Yes ok, I will work it out now. If I have further questions, I will post here again tomorrow.

So that is basically my 4th equation, but you include the masses to make the forces instead of the accelerations? Could you also use just my 4th equation that deals with only acceleration to solve?

Yes, I understand your corrections to the first 3 equations since I forgot to put the mass numbers in, but I don't understand the final one?

Since you said earlier about the velocity, distance, and acceleration ratio, is this correct? m1a1 = mg-T1 m3a3 = mg-T1 m2a2 = 2T1 - mg For the second mass in the middle, since it has two tensions, it has a slack value of 2, so if I set the displacement as y for each one while assuming...

To tell you the truth, I am still not sure what you mean. If m1=m3, then there should only be 2 equations= m1a1 = m3g-T m3a1 = m3g-T , wouldn't these two cancel out, leaving: m2a2 = 2T-mg? I don't know, but I'm thinking that if m1=/m3, then m2 is: m2(a1+a3)=2T-mg? But this can't be...

Before I try that, I just want to clear one small thing up. Say, I have only one pulley (I'm not sure if it matters if it's a heavy one or not), and I put two masses on each string. Now, if one falls down, would the two have the same velocity but in opposite directions? If so, can this be...

I don't know what you mean by constraint equations, but the three force equations I came up with were: m3a= T-mg m2a= 2T-mg ma= mg-T

Homework Statement Three objects m1. m2 and m3 are suspended from three massless and frictionless pulleys as shown in the diagram. ml is 6 kg, m2 is 2 kg and m3 is 3 kg. Find the tension of the string when the system is set in motion (i.e. all masses are moving). Answer in N. Homework...

Ok... so a conservative force is something like Gravity in which case it can 'store' energy, like potential gravitational energy? A conservative force is one that cannot 'store' energy, similar to when you are pushing something against friction the kinetic energy is lost to it? If so, where...

Technically, I don't really have a problem specifically that I need help on solving, but there is a crucial concept that I cannot grasp about the WET, and until I can do so, most WET problems are a pain to me. My professor gave us two types of formulas for the work energy theorem, stating...

Homework Statement A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley, and back down to the man's hand, wants to pull himself up. The mass of the man and the chair combined is 95kg, with what force magnitude must the man pull on...

Thanks for all of your help, I think I've got most of the answers correct. Sorry for not being clear in the question, but there were like 6 different parts to it, so I only posted the questions that seemed unclear to me (the ones that I spent like 3 hours on to no avail). I had to find...

Yes, I got to the part where it asked me to find the displacement from 5s-10s. I got the right angle (or at least understand how that works) at 135 degrees, but I can't get the right displacement, and thus, I cannot get the right velocity or acceleration either. If I want displacement, don't...