User talk:Sjlegg

Thank You!
hey, a quick thanks for the as physics wikibook, has been a huge help to me and my classmates. we're going into the exam tomorrow (22 may). any hope of seeing the A2 content on wikibooks? i said thank you in another page, but i think it was in the wrong place and it got deleted by some tightarse moderator. thanks again, benmatthews90 —Preceding unsigned comment added by Benmatthews90 (talk • contribs) 18:35, 21 May 2008 (UTC)  (Moved here from my talk page on Wikipedia)

just want to say thanks for putting up your physics textbook - it saved my life tonight!! Hope you get the A2 stuff ready for when I start it in September! :D 86.147.242.144 (talk) 18:07, 18 February 2008 (UTC)

Your physics material is layed out quite well however you need to brush up on your knowledge of resistors in parallel. I noticed on the internal resistance page the answers to questions were incorrect because you left the resistance in 1/r form and didn't flip it back so the resistance was a lot smaller than it should have been. i have corrected this.

Image:Sonar Principle EN.svg
G'day, this image on Commons has been fixed so that it doesn't render with garbled text; the German text was still there with display:none, but apparently ImageMagick doesn't honour that style directive. I haven't changed your page to use the Commons SVG, however, as I notice you have also changed a variable name in your PNG version. Webaware talk 11:55, 9 April 2008 (UTC)

lemon123
I'd like to echo everyone's thanks for providing such a useful resource for my A level Physics course; the Advancing Physics textbook written by IOP is rubbish (as is my teacher), so your online textbook has made my life a lot easier. I just thought I should inform you of a major mistake you made in the section on radar and triangulation: you said that, for an electromagnetic pulse being transmitted, refeleted by an objected and receieved:

$$c = \frac{d}{2t}$$

whereas it actually should be:

$$d = \frac{ct}{2}$$

This kind of messed up everything on radar in that section, but I've corrected it all now.

Anyway, thanks again for producing this textbook.

AS Physics book (Sensors questions and worked solutions)
I note from your comment at the start of the answers page (http://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Sensors) that you declare yourself unhappy with the answers. I agree and would like to assist if possible. I think the problem lies in the question. LDRs are not linear in their relationship to the light source and so, whilst the mathematics of the answers is correct, the physics is dubious. The answer to question 7 is wrong since if we assume the -ve terminsl to be zero Volts then the left hand side is at 0V and not nine as stated. The difference at the amplifier is therefore 5V and not 4 as stated.

I do not want to offend the original author. I think the question would be better if it were changed to a thermistor which is fairly linear but in any case needs fixed. I am very new to this wiki stuff and so am reluctant to bash on and change things. Your advice would be greatly appreciated.

I am a physics teacher moving from the Scottish system to the English A levels ect and am looking for useful resources, hence my finding this site. I think in general it is great with loads of useful stuff. Errors need to be fixed though. Spittal (talk) 12:07, 17 August 2010 (UTC)

My advice to you is: Go ahead and 'bash on and change things', as you say! That's what wikis are for. Also, those pages are on my watchlist, so I'll know what changes you make and be able to help out if it looks like you need it. Feel free to ask me any other questions you have.

I hope the number of errors is gradually decreasing - they'll decrease faster if people fix them when they find them, though. It's good to know the wikibook is some use to someone! --Sjlegg (talk) 08:59, 21 August 2010 (UTC)