Biology; Chemistry; Physics: Post your doubts here!

[Lilly2318]

Gave Pakstudies and Islamiat before..

I haven't decided the subjects for Oct-Nov 2014, yet.

grades?

 

[Dark Destination]

how are some people getting 30kg water in that heat capacity question?

Got that wrong. Did the whole Section B, in 10 minutes.
I spent the whole time wondering about Section A, that i was totally panicked at the end.
Had to do two 15 mark question in Section B..

I forgot to multiply 9000 by 8, didn't read the question.

 

[Lilly2318]

Got that wrong. Did the whole Section B, in 10 minutes.
I spent the whole time wondering about Section A, that i was totally panicked at the end.
Had to do two 15 mark question in Section B..

I forgot to multiply 9000 by 8, didn't read the question.

i made numerous blunders as well . still hoping for best

 

[Dark Destination]

What was the result

grades?

A* in Pakistan studies, A in Islamiat. Which was a miracle. I sucked at Islamiat, didn't pay much attention to it, but the retakes saved me.

 

[Dark Destination]

i made numerous blunders as well . still hoping for best

Yes. Me too. (Y)

 

[potterfan97]

I think first we had to calculate the power i.e: J/s
Then using Q=Pt/mc*change in temperature calculate mass

 

[Dark Destination]

How do u ,manage. i swear ur not human

Lol, i am.
I barely manage. ._.
I have no idea how i do, but i just do.

 

[asadalam]

A* in Pakistan studies, A in Islamiat. Which was a miracle. I sucked at Islamiat, didn't pay much attention to it, but the retakes saved me.

Lol reverse for me,wish the retakes didnt happen.Same result as you though,although i got an A in urdu...

 

[Dark Destination]

I think first we had to calculate the power i.e: J/s
Then using Q=Pt/mc*change in temperature calculate mass

Really?

 

[asadalam]

Really?

Either way the answer would be the same

 

[Lilly2318]

Lol, i am.
I barely manage. ._.
I have no idea how i do, but i just do.

so u studied better in retakes

 

[Dark Destination]

Either way the answer would be the same

What did you write for why the large piston moves less and efficiency?

I wrote that the piston has a greater area, so has to move by lesser distance to accommodate the same volume of oil. I think i'm wrong. :/

And for Efficiency i wrote the ratio of useful energy output and energy input. It is a measure of how much input is converted into useful energy output.

 

[potterfan97]

Chaliye ek ijtimayi dua karte hain kay Insha Allah threshold kaafi low ho and everybody gets the grade they deserve. Ameen

 

[Lilly2318]

What did you write for why the large piston moves less and efficiency?

I wrote that the piston has a greater area, so has to move by lesser distance to accommodate the same volume of oil. I think i'm wrong. :/

And for Efficiency i wrote the ratio of useful energy output and energy input. It is a measure of how much input is converted into useful energy output.

i wort largeer force requores less distance

 

[Lilly2318]

Chaliye ek ijtimayi dua karte hain kay Insha Allah threshold kaafi low ho and everybody gets the grade they deserve. Ameen

InshAllah
duas are indeed powerful!

 

[Dark Destination]

so u studied better in retakes

Yes.
I was going to get B's if it hadn't been for the retakes. ._.
I wasted the whole month of April..
But then the retakes happened, and i was like.. Another chance to make it right. I started studying.
Had a week, finished the whole course of Pakistan studies, and studied Islamiat too. So things worked out.

 

[Dark Destination]

InshAllah
duas are indeed powerful!

InshaAllah

 

[asadalam]

What did you write for why the large piston moves less and efficiency?

I wrote that the piston has a greater area, so has to move by lesser distance to accommodate the same volume of oil. I think i'm wrong. :/

And for Efficiency i wrote the ratio of useful energy output and energy input. It is a measure of how much input is converted into useful energy output.

Same for efficiency,though piston one is wrong i guess ,i wrote it travels less distance to reduce friction between cylinder and piston and therefore ensure max energy transfer to the arm.

 

[Lilly2318]

Same for efficiency,though piston one is wrong i guess ,i wrote it travels less distance to reduce friction between cylinder and piston and therefore ensure max energy transfer to the arm.

is mine right that larger force need less distace, smthing like this?

 

[Zain Salman Dar]

I chose acceleration for that. I think its kinetic maybe now.

it can never be kinetic as decrease in k.e = gain in gpe . So answer is acceleration