Physics: Post your doubts here!

[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?

 

[The Sarcastic Retard]

i cannot confirm whether the ans is right or wrong. but previously, i did not read the qu properly. it says the extension is the same.

But according to me previous answer was right. I don't know anything else.

 

[M.A. Chowhan]

vie

umm

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

view post 12623

 

[kishmishdoll]

can i take a subject in Alevels which i have not opted in AS?

 

[mushoo]

aoa!
june 03, question 11!
anybody plz tell me y da answer is B?

 

[qdkhan]

Can anyone please explain what question 3.c.iii in May june 2011 P2 means?what exactly do they mean when they say max. weight?
here's the link:
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf

 

[qdkhan]

check qu 243 at
http://physics-ref.blogspot.com/2014/12/physics-9702-doubts-help-page-39.html

How can the weight vary?isn't it a constant value?

 

[yoyo00xx]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w11_qp_21.pdf

question number 3 part b) iii) any body explain Glory Hunter The Chill Master lionel 10 Wkhan860

 

[The Chill Master]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf

question number 3 part b) iii) any body explain Glory Hunter The Chill Master lionel 10 Wkhan860

distance / time the time u got in b ii part
distance is 6.15/1.33 = 4.65ms^-1
i got time 1.327 in b ii

 

[janasalem]

hi can someone please explain question 7
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w05_qp_2.pdf

what does the voltmeter measure and how does it show 0 reading ?

 

[yoyo00xx]

distance / time the time u got in b ii part
distance is 6.15/1.33 = 4.65ms^-1
i got time 1.327 in b ii

ya why distance/time???? Glory Hunter The Chill Master

 

[qdkhan]

I

it's asking for example : whether a bigger person would be there, ....

Thnx a lot!

 

[The Chill Master]

ya why distance/time???? Glory Hunter The Chill Master

sir u take ur head and hit it with wall its bouncing back velocity will be only s=ut since it will only hv horizontal component vertical component is zero cuz draw a vector diagram on the given diagramit will be a straight line on y axis dat means x is zero so left is horizontal component and dats y s=ut sorry for late reply

 

[qwertypoiu]

Somebody please help,
In this paper, in question number 4, it gives a stress-strain curve (BTW flipped axis to trick you when finding Young's Modulus) then says:
"State whether the material of the rod is ductile, brittle or polymeric."

Now I know it's brittle cuz it breaks/snaps at a point, and I know that for a ductile material it would curve to undergo plastic deformation, but I'm curious as to what the graph of the polymeric material would look like.

If possible, can someone post an image of the stress-strain curves of ductile, brittle, and polymeric materials being shown side by side?

Thanks.

 

[Bhargav Poudel]

May/June 2013. Paper 13. Number 30. Can anybody explain?