Physics: Post your doubts here!

[Snow Angel]

He will quote you dw

dw?

 

[Thought blocker]

Neither did I

then how did u know ?

 

[Thought blocker]

dw?

Don't worry

 

[Snow Angel]

Don't worry

ok

 

[asma tareen]

then how did u know ?

It came In my mid term exams i did it wrong

 

[Thought blocker]

It came In my mid term exams i did it wrong

Woops! so you got its solution Any doubts ?

 

[Snow Angel]

It was a doubt wasn't it?

please can you tell why should divide the height by 2 for the 10th question in paper 1 may june 2012 variant 13 regarding the man and the barrel? thanks

 

[ZaqZainab]

please can you tell why should divide the height by 2 for the 10th question in paper 1 may june 2012 variant 13 regarding the man and the barrel? thanks

the only time the man head will level with the bottom of the barrel will be in the middle if the man goes 10 meters up the barrel will not level it be below his head
i hope you get the point here

 

[Thought blocker]

the only time the man head will level with the bottom of the barrel will be in the middle if the man goes 10 meters up the barrel will not level it be below his head
i hope you get the point here

Genius...

 

[ZaqZainab]

Genius...

Sarcasm?

 

[Thought blocker]

Sarcasm?

Irony

 

[Snow Angel]

the only time the man head will level with the bottom of the barrel will be in the middle if the man goes 10 meters up the barrel will not level it be below his head
i hope you get the point here

yes thank you

 

[IGCSE O/L student]

we'll take this problem in terms of the forces acting on the barrel and the man
for the barrel: the force due to the barrel - the tension in the rope(T) = ma (because the barrel move's down, the force due to the barrel is greater than the tension)
(120*10) - T = 120a (we dont know the acceleration of the man and the barrel)
for the man: the tension (T) - the force due to the man = ma
T - (80*a) = 80a
find the value of a using simultaneous equations, which is 2 ms^-2
using v^2=u^2 + 2as
find the final velocity of the man at 9 m, taking u as 0 ms^-1

Credit-- > IGCSE O/L student

I feel honored

 

[leadingguy]

is Thermal Physics included in As level ??

 

[Thought blocker]

I feel honored

You deserved so.

 

[Thought blocker]

is Thermal Physics included in As level ??

NO

 

[leadingguy]

cool!! then too light syllabus it is .. The thing is k I forgot all and messed up. with what is in A level and As level. Thank u for the assistance

 

[Thought blocker]

cool!! then too light syllabus it is .. The thing is k I forgot all and messed up. with what is in A level and As level. Thank u for the assistance

Anytime

 

[usama321]

Can someone please help me with q4 part c. Thanks

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[Thought blocker]

Can someone please help me with q4 part c. Thanks

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

stress = force / area
For max area, we need to know min area so,
Force= 1.9*10^3 , Stress= 9.5*10^8 We got stress from b part
so min area= F/S
=(1.9*10^8)/(9.5*10^8)
=2*10^-6
So for max area= Cross-sectional area-min area
=(3.2*10^-6)-(2*10^-6)
=1.2*10^-6 (FINAL ANSWER)