Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Syed Kazim:
--- Quote from: Syed Kazim on May 26, 2010, 11:38:57 pm ---I think this is what you meant by image properties:
Converging Lens
Object between F and Optical Centre - Virtual, Upright and Larger than the object.
Object between F and 2F - Real, Inverted and Larger than the object.
Object at 2F - Real, Inverted, Same size as the object.
Object beyond 2F - Real, Inverted and Smaller than the object.
About that question:
Give me a few minutes please... let me figure it out.
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In the diagram, when the magnetic field lines are drawn, they will go from the left of the page to the right, thus pushing the wheel in the same direction, i.e. anti-clockwise.
6394:
--- Quote from: Syed Kazim on May 26, 2010, 11:52:49 pm ---Lol... we're all working hard. When we get the A*s, we'll deserve it. :)
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yup InshAAllah
Syed Kazim:
--- Quote from: Nidzzz on May 26, 2010, 11:54:42 pm ---hey this thng ticker timer stuff is it dere if yes i wuld appreciate if u gud teach :)
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Let me check the syllabus... I don't think it's there though.
the_grim_reaper:
--- Quote from: Ivo on May 26, 2010, 11:26:40 pm ---Thanks, you're amazing! By the way, for the pump water higher, how does it work, I still don't get that bit.
By the way, for the formula you're teacher told u is distance (s) = 0.5(u+v)t
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Ivo the formula I wrote oh sh*t sorry it's distance=ut+.5at^2 (a is acceleration. Sorry for using mass! VERY VERY VERY VERY SORRY!!!) U see that's why I don't like to answer questions even if I know the answers. I'm afraid I might tell something wrong and it'll screw the guy I'm trying to help :D.
Anyway, you see some hydroelectric stations have a pumped storage feature. See demand varies at different times and seasons bla bla bla. So when demand is less and u're producing more energy, you can use it to pump the water that goes out of the dam back up to a higher-level reservoir. My book claims that it's easier to do this than to reduce the output of the generator (who wants to stop running water :D)..
So at peak times, the water will flow out again from the high level reservoir and the pe it has is converted to electrical energy. You can get 3-quarters of the electrical energy that was used to pump it back up in the first place.. (this answer is correct so it can be relied upon :D)...
Syed Kazim:
--- Quote from: Syed Kazim on May 26, 2010, 11:56:46 pm ---Let me check the syllabus... I don't think it's there though.
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The words 'ticker', 'timer' and 'ticker-timer' do not appear anywhere in the syllabus.
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