Physics: Post your doubts here!

[princess Anu]

shouldn't it be A? if we take this as a straight line answer comes 0.1 but since strain energy would will less than this ans should be A ?

 

[Dream.Eater]

Can anyone please explain how to draw two waves with a phase difference?
for example, "draw two waves of identical frequency,wavelength and amplitude and with a phase difference of 5π/8"

any supporting materials or links would also be greatly appreciated
Thanks in Advance!

 

[a_wiserME!!]

does anyone have revision notes for as level physics??
TIA

 

[princess Anu]

why are we using the volune calculated in ii1 for finding separation of atoms and not the volume found in i?

 

[princess Anu]

this is the question i was talking about

 

[Dream.Eater]

it's explained at
http://physics-ref.blogspot.com/2015/01/physics-9702-doubts-help-page-55.html

Thanks a lot!

 

[princess Anu]

why can't it be b?

 

[Math Buddy]

why can't it be b?

i hope you get it

 

[princess Anu]

i hope you get it

but then shouldn't it be 2/1 instead of 1/2?
since Density is inversely proportional to volune right? so ratio of densityp: densityQ should be volumeQ: volume P ,, No?

 

[Paris Palmer]

check qu 315 at
http://physics-ref.blogspot.com/2015/01/physics-9702-doubts-help-page-54.html

When we calculate Escape Speed, we use the formula square root[2GM/R]. Here why do we assume the radius,r, as the radius of Earth,R? Escape speed is the speed with which a body moves from gravitational field to infinity. What if its initial position in the gravitational field from where it escaped to infinity was not on the surface of Earth? Why do we use R? Shouldnt we use r as the distance of its initial position from centre of the Earth?

 

[Xerav43]

Can someone help me with paper 02 may june 2008 question 6)b) ? It's not making any sense no matter what I try to do. Thanks

 

[qdkhan]

salam! Can sum1 please explain the following?
q23 in May june 2012 p23. i understand as to why is it C, but not why the other choices are incorrect.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_11.pdf
q20 in May june 2011 paper 11
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf
q22 and q23 in May june 2013 paper 11
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_11.pdf

 

[Paris Palmer]

are you referring to a specific question. if yes, tell me which question it is

If a body is present in the Earth's gravitational field, but not on the surface of Earth, then it escapes to infinity. The formula of its escape speed is square root(2GM/r). Here, why r is taken as the radius of Earth?

 

[Paris Palmer]

No its not a specific question. I am just confused why we always take r as the radius of Earth in the formula of Escape speed?

 

[Paris Palmer]

take a look again at the derivation of escape speed. i have added as solution 358 at
http://physics-ref.blogspot.com/2015/02/physics-9702-doubts-help-page-59.html

maybe you are misunderstanding things

So Escape speed is only when an object escapes from the surface of Earth and not from any other point in Earth's Gravitational field?

 

[Paris Palmer]

yeah

Okay Thankyou..

 

[qdkhan]

2 of them is explained at
http://physics-ref.blogspot.com/2015/02/physics-9702-doubts-help-page-59.html

Shdnt the elastic limit be exctly at T, bcz if force equivalent to the value of force at T is applied, the wire still regains its original shape and length?

 

[princess Anu]

is it correct?

 

[princess Anu]

and this??

 

[Bba321]

Hi please help me with http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s03_qp_4.pdf
Qs 3
And

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w05_qp_4.pdf

Qs 5 b part 2

Thankyou