How'd your physics Papers go ?

[Dukeofwin]

What was the ans of mcq 7...force on p?

The explanation to which is, The rightward force was 8N and the leftward force was 18N! Making an resultant force of 10N leftwards(Anti Clockwise)
To balance it we had to multiply a force with 2cm to get 10N!
And thus the answer is 5N

 

[17194]

The explanation to which is, The rightward force was 8N and the leftward force was 18N! Making an resultant force of 10N leftwards(Anti Clockwise)
To balance it we had to multiply a force with 2cm to get 10N!
And thus the answer is 5N

It wasn't a force, rather moment of a force. And the values were 0.18Nm and 0.08Nm.

 

[MustafaMotani]

No way!
Dont make us lose a mark!
Whats the procedure?

It was 1.08 Mj

 

[sifat azeem]

what was the ans to the mcq about those thermometers?? C?

 

[MustafaMotani]

what was the ans to the mcq about those thermometers?? C?

yeah i wrote that

 

[manicooljay]

o bhai , you really don't have a good memory , no offense
1st column was electron flow
2nd coulumn was conventional current
it was option D
electron
<------------
current
------------>

boy ur arrows are in reverse direction xD

 

[manicooljay]

Option C i.e by vibration of atoms and the movement of electrons.

no it was D only vibration of atoms electron dont transfer heat!!!!

 

[MustafaMotani]

no it was D only vibration of atoms electron dont transfer heat!!!!

u are wrong in metals electrons transfer heat

 

[manicooljay]

u are wrong in metals electrons transfer heat

they transfer electricity only!!!

 

[MustafaMotani]

they transfer electricity only!!!

transfer heat as well please dont argue

 

[manicooljay]

transfer heat as well please dont argue

ok

 

[MustafaMotani]

ok

Sorry for being rUde
But it does condut heat

 

[UziB]

no it was D only vibration of atoms electron dont transfer heat!!!!

Go check winter 2002 examiner's report of physics paper 2, in it the examiner himself has mentioned that heat is transferred by the vibration of atoms and movement of electrons in metals

 

[Spidey21]

Go check winter 2002 examiner's report of physics paper 2, in it the examiner himself has mentioned that heat is transferred by the vibration of atoms and movement of electrons in metals

isnt that the same??

 

[UziB]

isnt that the same??

Nope the atoms don't move, they vibrate about their fixed positions at the interior of a metal while electrons move about the exterior surface of a metal.

 

[Spidey21]

Nope the atoms don't move, they vibrate about their fixed positions at the interior of a metal while electrons move about the exterior surface of a metal.

so if the electrons move...how are they transferring heat?

 

[UziB]

so if the electrons move...how are they transferring heat?

The electrons will only be able to move once they absorb the heat energy, and their bonds with the positive ions break and their kinetic energy increases hence they start residing over the exterior surface of a metal. It's just like what happens to the atoms, only difference is that the atoms cant move since solids have a fixed shape and volume

 

[fatikhalid]

so if the electrons move...how are they transferring heat?

this process is free electron diffusion!

 

[manicooljay]

this process is free electron diffusion!

free electron what? heard it for first time in my life!!!

 

[manicooljay]

Sorry for being rUde
But it does condut heat

oh no problemo pal !!! thankx 4 telling..and yeah they do transfer heat i asked frm my teacher ...damn i lost 1 mark!!