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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230937 times)

Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1575 on: May 25, 2010, 09:25:50 pm »
Quote from: A@di on May 25, 2010, 09:24:41 pm
Its 2am here, im off now..night guyz. good luck.

night to u too .......pray for me ;)
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1576 on: May 25, 2010, 09:27:32 pm »
Quote from: //~|guMnam|~\\ on May 25, 2010, 09:22:33 pm
i didnt get 16.....if temp increases it should expand and it should become larger

hold on .. look at the size of B .. By the way yes metals do expand on heating but it is jus linear expansion and they expand by VERY small length

like Aluminium expands 0.00003per *C

B is said to have the least thermal capacity  = mass * specific heat capacity

as the mass is less compared to others.. thermal capacity too would be less
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1577 on: May 25, 2010, 09:28:40 pm »
Quote from: A@di on May 25, 2010, 09:24:41 pm
Its 2am here, im off now..night guyz. good luck.

ok dude .. bye imma solve 2 papers and sleep .. Thanks for your help today ! :D
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Offline guMnam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1578 on: May 25, 2010, 09:30:26 pm »
thku every one for every thing..bye cya tmrw and gud luk......imma solve 3 more b4 i can sleep :D
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1579 on: May 25, 2010, 09:41:02 pm »
I know, I know, your welcome! :P
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1580 on: May 25, 2010, 09:42:11 pm »
Can anyone please explain electromagnetic induction.  Which cuts which?
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Offline Naruto123

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1581 on: May 25, 2010, 09:56:31 pm »
june 07 q 30 ppr 1
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Offline W.J-Knight

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1582 on: May 25, 2010, 10:10:05 pm »
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1583 on: May 25, 2010, 10:12:25 pm »
How do u calculate the Circumference?
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1584 on: May 25, 2010, 10:14:33 pm »
Quote from: 123456789 on May 25, 2010, 09:56:31 pm
june 07 q 30 ppr 1



It has a sliding contact which is used for changing the current in a circuit
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Offline High-R

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1585 on: May 25, 2010, 10:14:58 pm »
hey ppl wats gravitational ENERGY?
i got this question of the stone being thrown upwards and comes down.....and it asks where is the gravitational energy the least....so the answer is: tht the gravitationalenergy is least when the stone is just about to touch the ground!!!

can anyone explain y?...and how..wats this Gr.Energy?
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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1586 on: May 25, 2010, 10:16:21 pm »
Quote from: hamz on May 25, 2010, 10:14:58 pm
hey ppl wats gravitational ENERGY?
i got this question of the stone being thrown upwards and comes down.....and it asks where is the gravitational energy the least....so the answer is: tht the gravitationalenergy is least when the stone is just about to touch the ground!!!

can anyone explain y?...and how..wats this Gr.Energy?
lol hamz no 1 noes
acha sun konsa ppr kr rahi hai!!!
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1587 on: May 25, 2010, 10:19:00 pm »
Quote from: ang3l on May 25, 2010, 10:12:25 pm
How do u calculate the Circumference?

One COMPLETE revolution is the circumference .. 
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1588 on: May 25, 2010, 10:21:17 pm »
Quote from: Ivo on May 25, 2010, 09:42:11 pm
Can anyone please explain electromagnetic induction.  Which cuts which?

Electromagnetic induction is the process of producing electricity from magnetism. Faraday suggested that a voltage is induced in a conductor whenever it 'cuts' magnetic field lines, i.e. moves across them. Note that a voltage is not induced if the conductor moves along them or is at rest.

The induced voltage increases with the increase of:
  • the speed of motion of the magnet or coil,
  • the number of turns in the coil,
  • the strength of the magnet.

To answer your second question, the conductor 'cuts' the magnetic field lines.
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1589 on: May 25, 2010, 10:22:32 pm »
can someone explain how we can reduce heat transfer by radiation, by convection and conduction please? respectively?

and how do you know which fuse to choose? like for a lamp that operates at .25 A, and the wire can carry 4 A, how do u kno tht the fuse is 1A :S:S:S

and gravitational energy is energy that an object has when its not on the ground (or any origin) so if u throw a stone from the mountain, right at the top is the most gravitational energy, and right at the bottom is the least.. proportional to height
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