Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
6394:
--- 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 .. ;)
--- End quote ---
lol at the m=60
:DDDDDD
Malak:
--- Quote from: 6394 on May 25, 2010, 10:16:21 pm ---lol hamz no 1 noes
acha sun konsa ppr kr rahi hai!!!
--- End quote ---
Lol....I understand tht.. :P
Vin:
--- 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
--- End quote ---
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 ;)
$H00t!N& $t@r:
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..
Vin:
--- 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..
--- End quote ---
LMAO !! :D gimme 2 mins ;)
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