Recent content by sanitykey

Thanks so much! This was confusing me for so long but i get it now, you're a star ^_^

Homework Statement If B0 = 5*10^-7 [T], relative permittivity = 2 and relative permeability = 1.15 how much energy is delivered to an area of 1m^2 by the wave in one second? Where B0 is a magnetic field measured in teslas. Homework Equations < P > = ((B0^2)*c*(1)) / (2*(vacuum...

That would be somewhat catastrophic! :S I suppose the computer could still make a beep code even if the motherboard was broke? If we assume it is the graphics card and it hasn't melted: What are the other most probable causes of failure in these circumstances? How easy are they to repair? If...

ATI Radeon 2900 XT "No input detected" My ATI Radeon 2900 XT 1GB will not send input to the monitor on booting the computer, but this was not always the case. The first sign of trouble came about a month ago when I was playing Left 4 Dead, the input to the screen went off as the map was...

I got caught up in exams recently and didn't get a chance to respond to this but it's a perfect explanation thanks!

Thanks for your response, I'm still not quite sure how to work this out though. The reason i used 273K was i was following a (what i thought to be) similar example i found at: http://www.chem1.com/acad/webtext/thermeq/TE3.html (the green box about 1/3 down the page) If i use 271K for both...

Homework Statement A 100 g mass of supercooled water at -2ºC in thermal contact with surroundings also at -2ºC freezes spontaneously. Calculate the entropy change of the universe assuming that the surroundings act as a large temperature reservoir. [The specific heat capacity of ice is 2090 J...

I got my marks back the other day and everything was ok ^_^

I think I'm wrong on the last bit, since the whole system is reversible the total entropy change should be zero i think and what i should of done is added all the changes in entropy to find the total change in entropy rather than taking the difference between the entropy input into the first...

Can anyone help me? I mean no response could be either my approach is so horrendous that it's completely wrong and not worth commenting on or everything could be ok? XD

Homework Statement A reversible composite heat engine operates between three reservoirs at temperatures of 400K, 300K and 200K. One engine operates between the 400K and 300K reservoirs and a second engine operates between the 300K and 200K reservoirs and is synchronised with the first. In...

I'm not sure about the right way but this is how i'd do it: 1. Convert the input string into separate words and store each word in a new string. 2. Apply whatever method you used in your initial class to produce HashSets for each of these word strings. 3. Convert these HashSets to arrays of...

Your program is entertainingly mind boggling XD if it helps i think this is the run through of what it actually does: 0: subsets(2, "abcd") Pass in n = 2 andAlso = "abcd" 1.1: subsets(1, "abcd2") 1st line of else statement n-1 = 1 andAlso + n = "abcd2" 1.1.1: subsets(0...

Thanks a lot that seemed to solve it for me ^_^

[SOLVED] Free fall far away from Earth (integral substitution problem) Homework Statement Given: v(x) = -v_1\sqrt{\left(\frac{R}{x} - \frac{R}{h}\right)} Find the time t. Homework Equations Listed above where v_1 , R , h are all constant. The Attempt at a Solution v(x) =...