Recent content by rafterman

Borek Honestly thanks, I am struggling slightly because I am playing catch up. Be away from school for a long while due to injury. I have re-read my books and eventually figured it out, some of the numbers I was getting originally as the answer were just not looking right, I really started to...

Yeah, I guess...my physics teacher just says read the books instead of him teaching it. Thanks anyway.

Hi Borak I know that's the equation I need, but the part in brackets is confusing me. I am not sure I am utilising it correctly. My book has the equation but no examples of it workings, so I can not see how the bracket part can be substituted for the numbers I have worked out.

Hi So are you saying that [1-e^(-t*R/L)] just means (-e) -2.72 to the power of the total -t*R/L

This is a simple question. I know the equation I am supposed to use but I can not get my head around one part. The part in brackets! I keep getting wild numbers as my answer The equation is :- I = V/R * (1 - e^t*R/L) can I ask someone to give me a step by step example of how you place...

Hi Thanks for all the help I could not have asked for any better. You get five stars from me! Cheers

Thats fantastic, thanks for the help. I have found the other equation for parallel plates. One last question tho, to calculate the net force on the oil drop would I be correct in using the equation:- Fnet = V/d - mg

Hi It does involve the oil drop experiment, Plates are 8mm apart with the top plate is maintained at a potential of +500V relative to the lower one. The mass of the oil drop is 4.08x10-15 kg with a neg charge = -4e. There is also a fixed charge Q=+200 x10-11 C 2.00mm horizontally from the...

Homework Statement I am looking to calculate the horizontal and vertical components of an electric field at the point of the oil drop can someone tell me if I am on the correct tracks by using the following equation. Homework Equations E=kQ/r2 The Attempt at a Solution

Homework Statement why a more massive communications satellite doesn't orbit more slowly than a smaller one? Homework Equations The Attempt at a Solution The larger satellite will have more mass but it will also have a far greater gravitational force acting on it no matter where...

I know that gravity causes the downward force, but to keep us in ballance there is an upward force.Can someone tell me what causes this upward force.

Thanks Thanks for that, That is what I thought, it must be a miss-print on my homework sheet. Confused me tho!

I know that the moon is receding away from the Earth at about 3.8cm per year as a result of tidal torques exerted by the Earth on the moon. Will this change the length of the year,if so how do I calculate the estimated change as a result of this.