ALL PHYSICS DOUBTS - POST HERE !!

[Syed Kazim]

where do u live
r u givin xam in mornin?

Yes, I am. Its 2am here.

[Syed Kazim]

The distance of the object from the mirror (A in this case) must be equal to the distance of the mirror to the image (B in this case). Also, they must form in a straight line.

Oops. I thought you meant part (a). Anyway, just remember that in such questions the angle of incidence is equal to the angle of refraction.

[6394]

Yes, I am. Its 2am here.

it 2.55 hre
=P

[Syed Kazim]

it 2.55 hre
=P

Lol... we're all working hard. When we get the A*s, we'll deserve it.

[NidZ- Hero]

Lol... we're all working hard. When we get the A*s, we'll deserve it.

hey this thng ticker timer stuff is it dere if yes i wuld appreciate if u gud teach

[Syed Kazim]

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.

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]

Lol... we're all working hard. When we get the A*s, we'll deserve it.

yup InshAAllah

[Syed Kazim]

hey this thng ticker timer stuff is it dere if yes i wuld appreciate if u gud teach

Let me check the syllabus... I don't think it's there though.

[the_grim_reaper]

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

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 .

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 )..
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 )...

[Syed Kazim]

Let me check the syllabus... I don't think it's there though.

The words 'ticker', 'timer' and 'ticker-timer' do not appear anywhere in the syllabus.

[6394]

steady spd-->dist btwn dots stay de same
higher staedy spd-stays same thru out but the space By the way dots is more dan abv
acceleration-distan btwn dot in creases .......  .  .       .            .            .                     .                        .                  .
deceleration -.            .             .           .        .      .     . . . ..........
hope it hlps
 

[the_grim_reaper]

it 2.55 hre
=P

2 am in Riyadh . Guys I'm gona say it again PLEASE CAN ANYONE TELL ME HOW A BRIDGE RECTIFIER WORKS!!!!!!!

[Ivo]

10ai) Step up transformer obviously.

    aii) Less current, less electrical energy lost, less heat energy given out

    b) P = V*I, I = 55k/22k = 2.5

    c) Rate of loss formula, P = I^2R = 2.5^2*3  = 18.75

    d) The overall voltage reduced from 22K Volts due to the resistance of the wire, till it reaches the receiving end.

I know this is confusing sh*t, it had appeared in my paper! nov 09! V = 2.5*3 = 7.5

from wiki "For example, an electric space heater may very well have a resistance of ten ohms, and the wires which supply it may have a resistance of 0.2 ohms, about 2% of the total circuit resistance. This means that 2% of the supplied voltage is actually being lost by the wire itself."

       e) 22000 - 7.5 -7.5 = 21985 (2 times 7.5 because there are two wires, each voltage dorp = 7.5)

This is from W09, it's a nightmare.  What's voltage drop?

[Ivo]

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 .

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 )..
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 )...

Thanks man, great explanation.  I'll rep you!

[the_grim_reaper]

This is from W09, it's a nightmare.  What's voltage drop?

Drop in voltage . If power is being lost than it's bound to have an effect!!!