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Physics: Post your doubts here!

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http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_21.pdf


some help here required people ... thank you very much
need to clear some concepts
so need some explanations to the following
Q5 (c)

thanks again :) :)
5 c i) I think the force on P is in direction to the applied electric field whereas on N is opposite in direction to the applied electric field because since the direction of electric field is from +ve to -ve, P(which is +ve in charge) should be attracted to the -ve end. Similar concept applies to N.
ii) V/d = F/q
5 * 10^4(Given) = F / 1.6 * 10^-19
F = 8 * 10^-15
For torque, Torque = F * perpindicular distance between the two force of a couple. So,
Torque = 8 * 10^-15 * (2.8 * 10^-10 * sin 30)
= 1.12 * 10^-24

Hope I helped you out.
 
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Can someone please help me? My teacher set me a homework which i can't solve.
He told us to derive v^2=u^2 + 2as using calulus only
and i am pretty stuck
 
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Can someone please help me? My teacher set me a homework which i can't solve.
He told us to derive v^2=u^2 + 2as using calulus only
and i am pretty stuck

v=(a/a)v
v=((a/(dv/dt))(ds/dt)
v=(a)(ds/dv)
∫v dv = ∫ a ds

use limits: (u and v) and (0 and s)

you will get the answer..



 
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A general questions about practical: Should we use dots or crosses for the plotting points of any graph ? Thank you :)
 
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A general questions about practical: Should we use dots or crosses for the plotting points of any graph ? Thank you :)
Cross is advisable because we clearly know the center of the cross while it is difficult to know the center of dot...I hope u understood..:)..likha maine pushto hi hai...:ROFLMAO: feel free to ask again if u didn't get my point...:)
 
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Cross is advisable because we clearly know the center of the cross while it is difficult to know the center of dot...I hope u understood..:)..likha maine pushto hi hai...:ROFLMAO: feel free to ask again if u didn't get my point...:)

thank you... any other advises ?
 
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Sort of unrelated, but could someone PLEASE post up the answers from the CD to the end of chapter and exam style questions from the book : Cambridge International AS and A level, Physics coursebook, just the AS part if you can....Thnx a million, and GOOD LUCK!
 
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