Physics: Post your doubts here!

[ashcull14]

why is upthrust having the least magnitude ? as W= upthrust + air resistance so weight has the greatest magnitude ....but y is upthrust lesser than air resistance?

 

[ashcull14]

 

[M.A. Chowhan]

why is upthrust having the least magnitude ? as W= upthrust + air resistance so weight has the greatest magnitude ....but y is upthrust lesser than air resistance?

The magnitude of upthrust acting on an object is equal to the weight of the fluid displaced by the object.
The fluid may be liquid or gas.
If it is air, then upthrust is very small, because the weight of the air displaced by the object is very small.

 

[Serial_Ripper]

-just realized the book covers I posted weren't even visible-
Can anyone upload Cambridge's International As and A level Revision Guide for Physics?????

 

[M.A. Chowhan]

-just realized the book covers I posted weren't even visible-
Can anyone upload Cambridge's International As and A level Revision Guide for Physics?????

You might find this one helpful.

 

[princess Anu]

Can somebody please explain me these? Pleaseeeee
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_12.pdf Q9 Why is A wrong? and Q 10 too if possible

 

[M.A. Chowhan]

exploded diper
Please Explain me the graph of q2 part c
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_23.pdf

here is the solution with explanation

 

[M.A. Chowhan]

Please anyone help me with the graph
Please Explain me the graph of q2 part c
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_23.pdf

here is the solution with explanation

 

[M.A. Chowhan]

View attachment 49715

here is the solution with explanation

 

[M.A. Chowhan]

Can somebody please explain me these? Pleaseeeee
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_12.pdf Q9 Why is A wrong? and Q 10 too if possible

For your first question, read section 2.2 (uncertainties in the readings and measurements) in the attached notes.

 

[Serial_Ripper]

You might find this one helpful.

thnx

 

[princess Anu]

nov 2012 p12 questions are explained at
http://physics-ref.blogspot.com/2014/08/9702-november-2012-paper-12-worked.html[/QUOTE

View attachment 49691

this tooo

 

[ashcull14]

The magnitude of upthrust acting on an object is equal to the weight of the fluid displaced by the object.
The fluid may be liquid or gas.
If it is air, then upthrust is very small, because the weight of the air displaced by the object is very small.

thnk u so much

 

[ashcull14]

umm

here is the solution with explanation

.sorry . theres no attachment..cn u repost it plx?

 

[Binay22]

Two wire each have length 1.8 m and diameter 1.2 mm.One wire has Young modulus 1.1*10^2 Pa and the other has 2.2*10^11 Pa.One end of each wire is attached to same fixed point and the other end of each is attached to same load of 75 N so that each has same extension.Calculate the extension of the wires.How do I do solve this?

 

[Binay22]

Two wire each have length 1.8 m and diameter 1.2 mm.One wire has Young modulus 1.1*10^2 Pa and the other has 2.2*10^11 Pa.One end of each wire is attached to same fixed point and the other end of each is attached to same load of 75 N so that each has same extension.Calculate the extension of the wires.How do I do solve this?

 

[Binay22]

but the questions says the wires have same extension .and in the solution the extension is different for each wire

check qu 239 at
http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-38.html

 

[The Sarcastic Retard]

sorry, did not pat attention to the question correctly. i'll try to answer it later. do you know the final ans??

I got the same answer and I posted it in other thread. Our answers are correct.

 

[Binay22]

ok thank you
i just realised the first wire's Young Modulus was supposed to be 1.1*10^11.My bad!!

 

[The Sarcastic Retard]

i worked the question again. check it at
http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-38.html

So the previous answer was wrong?