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yea .. after every ppr there is one stupid question over which everyone fights.. there was one in chem too..!
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hamidali391 said:Firstly people let me clear your confusion about the Q of principal conversion of energy. KINETIC ENERGY=1/2 mv2..... sahi baat? there is no acceleration involved in gain of kinetic energy and so only velocity needed... Wether the velocity was constant or not there will be an increase in the kinetic energy according to the equation.. and he was falling so potential energy was being changed to kinetic energy... they had asked about the PRINCIPLE conversion, though heat is also produced but principally it was PE to KE... hope this clears.
And secondly the sec B last Q had a curve, current not necessarily becomes constant but there is a turn.. see the buk... u ll find a curve for a filament lamp.
LOL. It is a repeated question, search for it in previous papers of 2007, 2008 and 2009. See its marking scheme. Whatever was asked, the answer was OP.Mobeen said:yep !! CONFIRMED FOR SURE !!
momen said:book worm said:what momen said is not true
tell me that if the P.E is being converted to K.E at a constant rate, even then the K.E is not increasing but remaining the same.That means that the K.E is also being converted to Heat. They asked for PRINCIPLE CHANGE which would then be P.E to Heat
P.E to Heat is 100 %
wrong .!
i have confirmed it from akhter mehmood my acdmy sir.!!
BILALrox01 said:momen said:book worm said:what momen said is not true
tell me that if the P.E is being converted to K.E at a constant rate, even then the K.E is not increasing but remaining the same.That means that the K.E is also being converted to Heat. They asked for PRINCIPLE CHANGE which would then be P.E to Heat
P.E to Heat is 100 %
wrong .!
i have confirmed it from akhter mehmood my acdmy sir.!!
Time to change academy dude
Zishi said:LOL. It is a repeated question, search for it in previous papers of 2007, 2008 and 2009. See its marking scheme. Whatever was asked, the answer was OP.Mobeen said:yep !! CONFIRMED FOR SURE !!
ON 2006 Q7.. answer was P my bro... i did OP wehn praciticing but its wrong and so didnt forget this during the paperZishi said:LOL. It is a repeated question, search for it in previous papers of 2007, 2008 and 2009. See its marking scheme. Whatever was asked, the answer was OP.Mobeen said:yep !! CONFIRMED FOR SURE !!
BILALrox01 said:hamidali391 said:Firstly people let me clear your confusion about the Q of principal conversion of energy. KINETIC ENERGY=1/2 mv2..... sahi baat? there is no acceleration involved in gain of kinetic energy and so only velocity needed... Wether the velocity was constant or not there will be an increase in the kinetic energy according to the equation.. and he was falling so potential energy was being changed to kinetic energy... they had asked about the PRINCIPLE conversion, though heat is also produced but principally it was PE to KE... hope this clears.
And secondly the sec B last Q had a curve, current not necessarily becomes constant but there is a turn.. see the buk... u ll find a curve for a filament lamp.
P.E=mgh....rite. suppoz m=60 g=10 and h=10000
P.E will then be =6000000j....rite
K.E= 0.5 m vsquare rite.... nd v increases to 150m/s
K.E=675000
From 6 MJ only 0.675 MJ converted to K.E...Wherz the rest gone. R u saying K.E is calculated by the second
then P.E should be calculated by the second too.
@ 15 sec nd 1200 m he reached this speed ok
so rest of the distance is there no change to any other form of energy
plus its written somewhere in xplaining physics.
I did it correct while practicing, but now I did it wrong in the paper. Dammit!Mobeen said:same here hamidali.. i also did it wrong during practice .. remembrd it in the final ppr ..
sunshine said:thank GOD .!
it is gravitational energy into kinetic .!
look guys i know the mass and Velocity of parachute was constant but this does not mean that gravitational potential energy is not converting into kinetic energy ,,this means that there is a constant rate at which gravitational potential energy is changing into kinetic energy .!!
secondly there was also change of gravitational potential energy into heat but it was negligible as compared to kinetic energy .!
my sir explained me bout that
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