Physics: Post your doubts here!

[nehaoscar]

Min Ke = Max Pe
Ke = EPE - GPE. (Always GPE < EPE) If I say this, is my way correct?

Yep

Please see to it, if u have missed anything.
I am getting a great help from u.
So please..
Thanks

Hahah yep will do
I'll be off for a while though since my exams start tomorrow

 

[nehaoscar]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_qp_4.pdf
Question 6 Explanation please

compression of ideal gas at constant temp : internal energy is proportional to it's ke which is proportional to temperature
Since it's at constant temp. U must be 0. and since work is done on the system W is + so for U to be 0, q has to be -

Heating of solid with no expansion : w is 0 and since it's heated q is + so U is +

Melting of ice : no external work is done on the system so w is 0. melting = heated so q is + and so U is +

 

[nehaoscar]

Do anyone have Physics note..? like brief one for As..?

This has summary of the topics:
https://www.xtremepapers.com/community/threads/as-and-a2-physics-summaries.42827/

 

[Catherine_1]

In smoothing circuits, why does increasing capacitance of the capacitor and resistance of the load result in more smoothing?Also,why is it difficult to change the value of voltage quickly if the two have higher values?

Does anyone have notes for alternating current chapter?

 

[The Sarcastic Retard]

Than

Yep

Hahah yep will do
I'll be off for a while though since my exams start tomorrow

Thanks* for ur help.. Hope to ge tmy others answers asap ..
Goodluck..

 

[Catherine_1]

Somehow the answers are contradictory in nature.:/ Should the answer simply be a bright spot?

Physicist and nehaoscar or anyone lol please help

 

[Catherine_1]

Please help!

 

[OmarKhan99]

View attachment 59340

Thanks a lot.
But why do the red and yellow lines have different gradients?

 

[Konstantino Nikolas]

Thanks a lot.
But why do the red and yellow lines have different gradients?

I forgot the question. But if the gradient of velocity-time graph is different it means the acceleration of motion at those times are different.

 

[Wâlèé Atèéq]

Than

This has summary of the topics:
https://www.xtremepapers.com/community/threads/as-and-a2-physics-summaries.42827/

Thanx Dude..!

 

[Eugene99]

Is Physics harder than Chemistry? I'll be taking AS Physics in Nov of 2016, since I'm taking AS Chemistry, Biology and Mathematics this summer, I was wondering whether I'll find Physics even harder than Chemistry or is it better than that?

 

[nehaoscar]

Than

Thanx Dude..!

Welcome

 

[Konstantino Nikolas]

Is Physics harder than Chemistry? I'll be taking AS Physics in Nov of 2016, since I'm taking AS Chemistry, Biology and Mathematics this summer, I was wondering whether I'll find Physics even harder than Chemistry or is it better than that?

Depends on which you have more interest in really. And they are two totally different subjects so dunno if we can compare their difficulty level. But I find chemistry questions more complicated than in physics ... especially AS.

 

[Eugene99]

Depends on which you have more interest in really. And they are two totally different subjects so dunno if we can compare their difficulty level. But I find chemistry questions more complicated than in physics ... especially AS.

I understand...and I think I'm better interested in Physics than in chemistry! Chemistry is just a helll!!
which subs are you taking?

 

[OmarKhan99]

I forgot the question. But if the gradient of velocity-time graph is different it means the acceleration of motion at those times are different.

Yes I know that. Can you please tell me why are the accelerations different?

This is the question

 

[Konstantino Nikolas]

Yes I know that. Can you please tell me why are the accelerations different?

This is the question

Ah yeah, it's this question.

Once the string is cut, the log doesn't immediately fall down. (I believe you understood that.) In the log's motion upward after the string is cut, there is friction acting on the same side as the component of weight - along the slope. So the addition of both forces divided by the mass of the log would give you acceleration.
On the other hand, once the log reaches a zero velocity, that is the maximum height it can go up to. Then, it starts falling down. In this part of its motion, the component of weight along the slope is opposed by the friction. So, acceleration would be the difference in both forces over the mass of the log.
Hence, the two accelerations are different and you get two different v-t gradients.

Hope you got it.

 

[Konstantino Nikolas]

I understand...and I think I'm better interested in Physics than in chemistry! Chemistry is just a helll!!
which subs are you taking?

Oh well then definitely you would find physics easier.
Chem phy math and eng.

 

[Syed Fakhar Hussain]

Few days back i searched every website i knew, no where a yearly binder with marks schemes was available.
When i was tired of finding thought why don't make one and help others.
Took me 4 hours but yes i made it .

Find it here :
https://www.dropbox.com/s/2qooifqxgpu47cq/P4 MJ_02-ON_15 (YEARLY).pdf?dl=0
_____________________________________________
__________________________________
_________________________
Time is precious waste it wisely.

 

[Syed Umar]

Few days back i searched every website i knew, no where a yearly binder with marks schemes was available.
When i was tired of finding thought why don't make one and help others.
Took me 4 hours but yes i made it .
_____________________________________________
__________________________________
_________________________
Time is precious waste it wisely.

Great.
Are you going to upload here?

 

[Syed Fakhar Hussain]

Great.
Are you going to upload here?

I am going to share a dropbox link in 5 mins just wait.