Physics 5054

[4hsan786]

Omg. Wasn't it Most Pressure? Wth.

Yes it was most pressure and the answers was B i.e the pin

 

[Firebender]

i picked pin too. lol, scared me.

 

[Rampag3r]

Ahsan, I want you to marry me. Or not. I'm straight. And I like apple pies. And blueberry, as well.
But that's not the point, the point is you saved me from suffering from a heart attack. B)

 

[Silent Hunter]

ya.............wasnt it most pressure?

 

[Rampag3r]

what was the answer to the mcq in which it was asking for least pressuse exerted on ground.was it the tire or heel?

Poor guy.

 

[4hsan786]

what was the answer to the mcq in which it was asking for least pressuse exerted on ground.was it the tire or heel?

Poor guy.

 

[no.mercy]

it was pin..lol

 

[Silent Hunter]

man......................was shocked ....................but now RELAXED.................AHH

 

[SuperDude]

it was chemical energy to gravitational potential energy + heat (i think)
and as for the temp difference its because initially as the water temp. rises the difference with the surrounding temp. increases, so heat is lost more rapidly to the surrounding and the water temp. rises slowly afterward. @ vishal

Actually, it would be Chemical Energy --> Kinetic Energy --> Potential Energy. As for the differences in change of temperatures, I just wrote that the rise in temperature per unit time isn't constant (non-linear), hence the change in temperature is less as time goes by.

 

[ibadsiddiqi]

I also wrote pin. Damn i almost got a heart attack.
Super Dude you are right about the energy changes. Chemical-kinetic-potential. however some energy is also lost as heat

 

[workaholic]

What did u guys write about the microwave mcq... I wrote B (detecting cracks in metal)... Hope its rite

 

[ibadsiddiqi]

I wrote A (cooking vegetables)

 

[lionkill3r]

The question about heating water and why temperature decrease less is because - when temperature increases the rate of evaporation decreases.Evaporation cools down the liquid. Therefore the temperature rise is less higher than earlier.

Can som1 tell me the answer for the question in p2 about Draw Wave B or sometihing and BN is between 2 wavefronts.... Is wave B drawn opposite ot wave A(inverted) with same frequency and wavelenght ???

For the microwae question i chose detecting cracks because other thing (cooking vegies, tanning and other one) use other parts of electromagnetic spectrum ( infrared )

 

[Firebender]

i also wrote A) cooking veggies

cuz x-rays are used for detecting cracks in metals.

 

[Firebender]

The question about heating water and why temperature decrease less is because - when temperature increases the rate of evaporation decreases.Evaporation cools down the liquid. Therefore the temperature rise is less higher than earlier.

Can som1 tell me the answer for the question in p2 about Draw Wave B or sometihing and wave 2 is between 2 wavefronts.... Is wave B drawn opposite ot wave A(inverted) with same frequency and wavelenght ???

i made shape sorta like in wall-e when he and eve are flying in space... or like dna.

 

[Silent Hunter]

me too......i tink i first chose B then A cuz of thinking abut microwaves

 

[lionkill3r]

or like dna.

oooh same here

Another question is in the physics p4 about the lens experiment to find focal length.
Is it putting a an illuminating object very close to the lens and moving a mirror till an inverted and magnified image is formed ???

 

[ibadsiddiqi]

It is microwaves. At first i thought that it was detecting cracks but then i figured that X rays are used for that purpose. So yea it definetely think its micrwaves

 

[lionkill3r]

err correct me if i am wrong but Microwave ovens use infrared rays ot heat and mobile phones and stuff use microwaves to transmit signals right ??? So how could heating vegies use microwaves
As i said earlier ichose detecting cracks coz thats da only sensible one ( ithink )

 

[Silent Hunter]

i know it tht microwaves do not use it................but still i also knew that other options werent correct too.....and i was sure that detecting rocks is done by X RAYS OR gamma ones.....so it cant be micro ones