Recent content by Icetray

Homework Statement Hi guys, I don't really need help with answering the dollowing question but just have a quick question about it. I solved the first part of the question with an energy balance by letting q_{conduction} = q_{convection} to get the temperature of he outer...

Yups, that's all the question says. Nothing before that and no hints after that. :( I guess I'll just stick to 0 then. Is it possible though that it could be a shifting problem instead of a unit step function?

Thank you so much for your reply Halls of Ivy! It's much appreciated. The exact question is actually just "Find the Laplace transform of:". I apologize for leaving it out. So just to confirm, the answers for both questions are actually 0? Seems a little weird that they've give us two...

Homework Statement The Attempt at a Solution I know that u(t) is a unit step function and holds a value of either 0 or 1. In laplace transform, when we integrate f(t) from 0 to infinity, we take u(t) to be 1. In this case, since u(t) is u(-t), does this mean it holds a value of 0? Does not...

-- it's okay, I for it. Really stupid question. hahaha ---

Thank you so much! :D

Hi guys, I was studying the proof below and just can't figure out the the first highlighted step leads to the second and I was wondering if you guys can help me to fill that in. (: Thank you so much for your help in advance guys!

Oh I was referring to this when I said your method and this: \frac{np2 - nc}{ns - nc} = (- \frac{Ns}{Np1})(-\frac{Np1}{Np2} When I was referring to my method. Was my approach wrong? Sorry for asking so many questions!

Thanks for the quick reply but I still don't get the answer with your method. ): Anyways, can I ask if the method I used is wrong? Can I set the sun as my input and the planet 2 as my output or this that wrong? ):

Thank you for your reply veko! Really appreciate it! I managed to solve for the speeds of nr and np2 but I'm having issues with finding the speed of np2 now. This is what I did (ccw +ve): \frac{np2 - nc}{ns - nc} = (- \frac{Ns}{Np1})(-\frac{Np1}{Np2} \frac{np2 +200}{0 + 200} = (-...

The attempt at a solution \frac{n2 - n6}{n5 - n6} = \frac{- 18}{30}\frac{-28}{20} The answer is -30.9 rad/s (clockwise). The problem looks rather simple and I'm really not sure what I'm doing wrong. Also if anyone knows where I can get more worked examples on these kinds of problems I'd...

First off, thank you for the replies guys! And I apologize for thelate reply. Hmmm... so Veko, what you're saying is that for the internal gears (everything minus the ring gears), we can take their relative velocities and use them to solve using the spur gear formulas? i.e...

Thanks for the reply voko! Anyways is there a special name for this proportionate value? I was attempting another problem and this time it's on planetary train gears but I'm a little lost. This is the question: I'm managed to solve for the ring gear using: \frac{nr - nc}{ns-nc} =...

Hi guys, I was doing my tutorial and given the angular velocity of the first gear, we were required to calculate the angular velocity of the 8th gear given just the no. of teeth for all the gears. Now I know that there must be a faster way of calculating the angular velocity of the 8th...

Ah! I feel so silly now. :-X Anyways thanks guys! (: