Recent content by MarkFarrell82

Yeah thanks for the solution. It's really helpful. Cheers "Let the fulcrum reaction be R." Will this fulcrum reaction always be zero in virtual work problems where the overall answer is zero? Is the fulcrum reaction in there to make the answer more complete? I follow all the working out...

Thanks Studiot :smile:

Fulcrum is the pivot point, right? Or the point around which the forces act? If you change the diagram so the fulcrum was furhter over to the left for example, the equation would still hold?

Also Tim, thanks for all your guidance. I prefer to be led than told.:smile: I notice your background is Mathematics. I feel mines rusty, are there any texts you'd recommend from a Physics perspective to help me brush up?

How about now for the attachment?

Thanks again for the responses. It's funny how you can lose the plot with things sometimes by focusing on one little but. The whole sub title of the section is Gravitational Energy so the I guess the clue is in the title. I've attached a copy of the section of text I've been mulling over trying...

Just a thought, the equation I'm supposed to write down, should it be something like the sum of the weights x heights should be equal to zero or is that too simplistic?

Hi tiny-Tim, Thanks for the response. I think I've missed the point completely. If it's asking me to write an equation, then it's asking me to write down a general formula for every case surely? But isn't that what the W2L2=W1L2 formula is? If you make up numbers to put into the formula it's...

Hi, I've been reading chapter 4 in the Feynman Lectures on the conservation of energy and I've bought a book off amazon called Exercises in Introductory Physics which accompanies the series. Having looked at some of the questions I feel well out of my depth because essentially I haven't ever...

Hi Gnosis Thanks for the response. Only just had the chance to look at it. Mark

Hi all, I've been reading the Feynman Lectures on Physics and I've stumbled on something. I understand the theory but not how they arrived at the answer. It's to do with firing a bullet from a gun and working out the speed it would need to travel in a curve around the Earth's surface in order...

Thanks again guys. I love this forum. I'm learning loads and if not finding out other things to look at. Could be on here all day at the minute

Sorry to take this back a little bit chaps but just a basic one to help visualise what's happening. As I understand it, a photon collides with an electron and passes on some of its energy. This is enough energy to dislodge the electron from the atom in the metal because its' only loosly bound...

Thanks both of you for your help..

Thanks for that. What happens to the metal or the atom in the metal that loses the electron? Does the electron get replaced so that it can repeat the effect again? If so, where does it come from? Do you know of any animations for this effect on the internet? I've looked around but I must be...