Physics P1 and P2: Discussi0n

[jafar]

@punctualpunk: the graph will be of inversly propotional as pressure is inversly propotional to area

wudnt the graph be a straight line ...

P = F/A

P is inversly propotional to area so this type ov graph will be made

 

[farrukh]

@hamidali:
the answer was potential to heat because the speed was constant
Just look at this relation K.E = 0.5mv^2 . The mass of parachutist is constant and its velocity is also constant so how would Kinetic energy increase?????Hope this makes clear

 

[farrukh]

@jafar:
How did you design the experiment to investigate effect of temerature on resistance....I think i made a mistake..I wrote that increasing the P.d accross filament would increase its temperature and then we can take current and voltage readings to calculate its resistance..Is my answer correct??

 

[book worm]

i agree with jafar

aur jahan tak jal kar rakh honay ki bat hai to thori heat generate hoti hai to environment may lose ho jati hai.. laikin agar bauhat door say koi cheez giray to sirf tab hi jalti hai..

moreover remember that LOSS IN P.E=GAIN IN K.E (only when the surface is smooth or there is no friction)

Furthermore,
Take an example:
an object of mass 10kg falls from a height of 20 meters and at a constant speed of 10m/s.

At 20m
P.E= 20*10*10=2000J and K.E= .5*10*100= 500J

now look that when its height will be 10 m, what will be the

P.E= 10*10*10=1000J and K.E= .5*10*100= 500J ( NO change in K.E)

where did the 1000J go? it was lost as heat to surroundings because there is friction due to air resistance.
they asked for the principle energy change which is P.E to Thermal Energy

 

[book worm]

just wanted to add that
LOSS IN P.E= GAIN IN K.E + HEAT ( work done against friction)
That is for a surface offering friction

 

[jafar]

it was to be designed by taking a heat source and and applyin heat on the wire of the circuit, as heat will increase the resistance of the wire will decrese and so will the voltage, but current will increase,

 

[beststriker]

@ jafar
also show the graph of current against p.d in last question of section B.

 

[habib123]

@punctualpunk: the graph will be of inversly propotional as pressure is inversly propotional to area

wudnt the graph be a straight line ...

its a straight line

 

[farrukh]

i got this one wrong

 

[book worm]

experiment could also be designed using variable resistor, you lower its resistance, current increases and temperature arises, resistance of resistor increases

 

[Mobeen]

i also think pressure-area graph wud be a straight line ..

 

[beststriker]

i also think pressure-area graph wud be a straight line ..

i dont think so.....

 

[beststriker]

@jafar
pls show the graph of current against p.d in last question of section b too.......

 

[Mobeen]

why ?

 

[beststriker]

All the physics papers (p1,p2 and atp) has the same weightage in total percentage.......or varies with the paper. for e.g 25% for atp, 25% for p1
Is there any policy like this.................

 

[jafar]

wait-me bathroom sa hoke ata hon!!

 

[Abdullahkhan92]

P.E to thermal energy people........... If it was P.E to Kinetic energy the person wudave fell flat on his ass and had broken every bone in his body....... ---,---........ and i hated that gay telephone mcq got that shit wrong, for some reason i thought that the circuit was complete and choosing any other given options wud screw the circuit........X.X........ anywho, mcqs were cake..... theory ka section B was a hoe......... the last two questions.... can someone tell me Where C was and wat size it was in section B ultrasound question........!!!!!!!

 

[jafar]

han to wat were we tawkng abt??

 

[beststriker]

check the thread........

 

[OakMoon!]

PEople bus karo... discuss karne ka no faida... only dissapointment... ab result ka intazar karo...