Physics: Post your doubts here!

[Silent Hunter]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_21.pdf​

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some help here required people ... thank you very much​

need to clear some concepts​

so need some explanations to the following​

Q5 (c)​

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thanks again ​

 

[champ-student]

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

(c) (i) arrows through P and N in correct directions
(ii) torque = force × perpendicular distance (between forces)
= 1.6 × 10
–19
× 5.0 × 10
4
× 2.8 × 10
–10
× sin30
= 1.1 × 10
–24
N m

 

[Silent Hunter]

(c) (i) arrows through P and N in correct directions

thanks but what are the correct directions ?

 

[Khunkar]

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.

 

[bloody_mary]

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

 

[AAAAAA]

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..




 

[D0cEngi]

Help meeeeeeHHHH....

 

[D0cEngi]

Help me with the uncertainity topic in p3.....plz....

 

[raamish]

How will we solve 4cii of qp W11/21. im having trouble with it: http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_21.pdf

 

[queen of the legend]

How will we solve 4cii of qp W11/21. im having trouble with it: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf

look at mark scheme this is self explanatory!

to find power you divide K.E which is also work done by time , and since efficiency of energy transfer is 25% you will multiple v by 0.25....so P= o.5 mv^2/t
now substitute for m/t which is mass of water flowing per second...simple

 

[queen of the legend]

Help me with the uncertainity topic in p3.....plz....

post a question that you dont understand !

 

[Silent Hunter]

A general questions about practical: Should we use dots or crosses for the plotting points of any graph ? Thank you

 

[queen of the legend]

A general questions about practical: Should we use dots or crosses for the plotting points of any graph ? Thank you

i think its up to you ..it doesnt matter u put dot , stars or crosses s long as you graph is right

 

[raamish]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s09_qp_2.pdf

In qs 8c(i) my asnwer was coming -10.1 Ns. So when i calculate the force should it come in negative or should i ignore the negative sign of momentum and solve it by: 10.1/3.5=2.94N ???

 

[geek101]

A general questions about practical: Should we use dots or crosses for the plotting points of any graph ? Thank you

a cross is advisable = )

 

[D0cEngi]

post a question that you dont understand !

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_31.pdf
Q.2 part (c) (iii)
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_33.pdf
Q.2 part (c)
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_34.pdf
Q.2 part (c)

 

[D0cEngi]

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... feel free to ask again if u didn't get my point...

 

[Silent Hunter]

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... feel free to ask again if u didn't get my point...

thank you... any other advises ?

 

[geek101]

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!

 

[D0cEngi]

thank you... any other advises ?

No just be punctual in your prayers....