New servers, hooraaaay! More bandwidth, more power.
Has to be. It was an MCQ in today's paper 1. I did electric shock..Anyway, I've got just one question today, like you know when we heat something, after we stop, we take the greatest temperature rise. In question 5 (c), November 2008, why are we subtracting 16.3 from 2.1?? I mean will the heater's heat not melt more ice after the it's switched off?? (If this question has been answered, just tell me the page number)Secondly, say if we're asked to find the latent heat of vaporisation of water, so we calculate the energy given AFTER it reaches the boil right?? Similar in ice like we calculate the amount of heat given AFTER it melts a little??? And like can a joule meter be used in a circuit like say we're using a heater. As soon as the water starts to boil, you switch on the joule meter. Basically, what I want to know is that will current flow through if it is not switched on? (So we can switch it on at any time and calculate the energy only for that interval??)
what are the advantages of using?a) split ring b) slip ringREPLY SOON!!urgent!!
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdfQ6)b)ii) Why does it stay the same? Isnt it supposed to be constant?Thanks
oooh i see i hav missed a lot here .. Any pending ques ?? Good job Aadi, Shazizzzle, Ivo, Kimo, Adzel .. (am i missing someone ?? )thanks .. for what ?? ..because even I had a couple of small doubts which were solved here
ok slip ring is used in AC generators .. Split ring is used in DC motors and DC generators .. lemme fetch imagesA.C. Generators DC GeneratorDC Motor
0.05g = 1sXg = 20X seconds120*20x = specific heat of vaporization * Xspecific heat ........ = 2400X/X = 2400kJ/kg
This question hasn't been answered yet, and I'm stuck on this as well. Many thanks in advance.
ok this is Charles' LawThe volume of a fixed mass of gas is directly proportional to its temperature if the pressure is kept constant meaning there is an increase in volume due to the temperature rise because the pressure is constant so here the change in vol. in b)i) is only possible because the pressure is kept constant .. so no change