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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230971 times)

Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1590 on: May 25, 2010, 10:23:41 pm »
m/j 2005 q32. The answer is b. why?? i thought its A. nd can u explain y its nt A...
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1591 on: May 25, 2010, 10:24:35 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?

@6394 .. i know :P muhje pataa hai :P

GRAVITATIONAL POTENTIAL ENERGY is the amount of energy stored in a body at a particular height ..
FORMULA :: P.E = m*g*h
mass, acceleration due to gravity(10 m/s2), and height

eg wen u stand on a flight of stairs of 10m then ur

PE = 60kg * 10 * 10
=6000J

wen u stand at the bottom of the stairs (ground level) your PE = 60 * 10 * 0 = 0 J

so least PE is at the bottom .. ;)
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1592 on: May 25, 2010, 10:28:45 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:24:35 pm
@6394 .. i know :P muhje pataa hai :P

GRAVITATIONAL POTENTIAL ENERGY is the amount of energy stored in a body at a particular height ..
FORMULA :: P.E = m*g*h
mass, acceleration due to gravity(10 m/s2), and height

eg wen u stand on a flight of stairs of 10m then ur

PE = 60kg * 10 * 10
=6000J

wen u stand at the bottom of the stairs (ground level) your PE = 60 * 10 * 0 = 0 J

can u exp the q i posted on pg 106 PLEASE? thanks :D

so least PE is at the bottom .. ;)
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1593 on: May 25, 2010, 10:29:52 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:24:35 pm
@6394 .. i know :P muhje pataa hai :P

GRAVITATIONAL POTENTIAL ENERGY is the amount of energy stored in a body at a particular height ..
FORMULA :: P.E = m*g*h
mass, acceleration due to gravity(10 m/s2), and height

eg wen u stand on a flight of stairs of 10m then ur

PE = 60kg * 10 * 10
=6000J

wen u stand at the bottom of the stairs (ground level) your PE = 60 * 10 * 0 = 0 J

so least PE is at the bottom .. ;)
lol mein to mazaak kar raha tha  :P :P :P
tumhe to sab ata hai :) :)
MA
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1594 on: May 25, 2010, 10:31:49 pm »
vin.. ca u exp my qs on pg 106.. nd tell me oct nov 2005 # 39...
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1595 on: May 25, 2010, 10:32:02 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:24:35 pm
@6394 .. i know :P muhje pataa hai :P

GRAVITATIONAL POTENTIAL ENERGY is the amount of energy stored in a body at a particular height ..
FORMULA :: P.E = m*g*h
mass, acceleration due to gravity(10 m/s2), and height

eg wen u stand on a flight of stairs of 10m then ur

PE = 60kg * 10 * 10
=6000J

wen u stand at the bottom of the stairs (ground level) your PE = 60 * 10 * 0 = 0 J

so least PE is at the bottom .. ;)
lol at the m=60
:DDDDDD
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1596 on: May 25, 2010, 10:32:18 pm »
Quote from: 6394 on May 25, 2010, 10:16:21 pm
lol hamz no 1 noes
acha sun konsa ppr kr rahi hai!!!
Lol....I understand tht.. :P
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1597 on: May 25, 2010, 10:34:09 pm »
Quote from: pglasg74 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


ok u can reduce heat transfer by using an insulator, shiny/light surface that reflects the heat, insulation or thick insulating materials
As far as i can comprehend
By conduction :: insulator/insulation
By convection :: (I have no idea :()
By Radiation   :: shiny/light surface

You come to know which fuse to use wen u look at the OPTIONS given in the ques .. usually a fuse which is more than the appliances' given amperes and less than the amount of current the wire the wire can hold

gimme a ques frm a past paper i'll help  ;)
« Last Edit: May 25, 2010, 10:37:57 pm by ~VIN1094~ »
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1598 on: May 25, 2010, 10:37:14 pm »
some1 answer my question....

@6394  aik bat puchoon tum larka ho ke larki? cz in one of ur posts u wr like "mein to mazak raha tha" but then ur profile shows ur gender as female..
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A=X+Y+Z, X is work. Y is play. Z is keep your mouth shut"- Albert Einstein

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1599 on: May 25, 2010, 10:41:47 pm »
Quote from: Shooting Star on May 25, 2010, 10:37:14 pm
some1 answer my question....

@6394  aik bat puchoon tum larka ho ke larki? cz in one of ur posts u wr like "mein to mazak raha tha" but then ur profile shows ur gender as female..

LMAO !! :D gimme 2 mins ;)
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1600 on: May 25, 2010, 10:42:02 pm »
Quote from: Shooting Star on May 25, 2010, 10:37:14 pm
some1 answer my question....

@6394  aik bat puchoon tum larka ho ke larki? cz in one of ur posts u wr like "mein to mazak raha tha" but then ur profile shows ur gender as female..
lol no m a larki
but have this aadat of sayin .....ga ga ga
rofl :P ;D ;D ;D
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Offline pglasg74

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1601 on: May 25, 2010, 10:45:19 pm »
Quote from: ~VIN1094~ on May 25, 2010, 10:41:47 pm
LMAO !! :D gimme 2 mins ;)



thxxx 4 ans. mine, can u answer the fuse one as well? and also, can you tell me oct/november 2006 #23 please? CAN SOMEONE TELL ME TEH RELATION BETWEEN FREQUENCY, AMPLITUDE, PITCH AND LOUDNESS PLEASEPLEASEPLEASEPLEASE?
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1602 on: May 25, 2010, 10:46:43 pm »
Quote from: pglasg74 on May 25, 2010, 10:31:49 pm
vin.. ca u exp my qs on pg 106.. nd tell me oct nov 2005 # 39...

 remember this ..
In a beta decay a neutron changes to a proton and an electron .. The proton remains in the nucleus and electron is emitted as a beta particle

eg . isotope of carbon .. carbon 14

146C  ---->  714N  +  -1e

in your ques .. 145 neutrons remain the same .. 92 protons INCREASE to 93
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1603 on: May 25, 2010, 10:47:03 pm »
Quote from: 6394 on May 25, 2010, 10:42:02 pm
lol no m a larki
but have this aadat of sayin .....ga ga ga
rofl :P ;D ;D ;D
tomboy?
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1604 on: May 25, 2010, 10:48:54 pm »
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