Physics: Post your doubts here!

[Isaac CKR]

Why is the answer D?

 

[periyasamy]

Answer is C, anyone explain?

I really don't get this one, help anyone, answer is D

For the 1st question,its simple.Get the volume by density formula.Then square root it with 3 n u will gwt the distance.
I am not sure with the second one.

 

[periyasamy]

Can anyone explain

Answer is 2 and 3. Why?

And

Answer is D. Is it because it is impossible to be 0A current when there is max PD?

Bro for 1st question I am not sure.My logic is this,the gradient is FL/AX
Gradient of p much steeper than q.So the young modulus of p must be greater than q
However,based on m=fl/ax,u find out than when gradient value is larger,extension is smaller.Than shows option a is wrong.
I guess u understand 2 and 3 as option 2 is calculation n 3is theory which is rite.

For the next question,its a concept whereby when no current,there is no current flowing there is no p.d.
when pd is low that is when the resistor show min value,the overall resistance decreases...So current exceeds to high value.

 

[Jinosupreme]

For the 1st question,its simple.Get the volume by density formula.Then square root it with 3 n u will gwt the distance.
I am not sure with the second one.

Just found out how to do 2nd one,
Use formula s=ut + 1/2at^2
Firstly
x = 0 + 1/2a(t1)^2
Next
x + h = 1/2a(t2) ^2

Sub together
1/2a(t1)^2 + h = 1/2a(t2)^2
And I think u know how to move the rest into correct places Thanks a lot!

 

[periyasamy]

Hello guys.Does the term increase in separation of fringes means that the x value in formula lamda=ax/d increase or decrease?Thank u.

 

[periyasamy]

Just found out how to do 2nd one,
Use formula s=ut + 1/2at^2
Firstly
x = 0 + 1/2a(t1)^2
Next
x + h = 1/2a(t2) ^2

Sub together
1/2a(t1)^2 + h = 1/2a(t2)^2
And I think u know how to move the rest into correct places Thanks a lot!

Thank u boss.

 

[Jinosupreme]

Hai guys,anyone can explain why is z compression?I think i know why point x n y is tension as it is against weight.

U imagine ur hand curve into the same shape, u will realised the part of Z is a compression. Just like when u bend a eraser, there will be a tension on top, but compression below

 

[periyasamy]

U imagine ur hand curve into the same shape, u will realised the part of Z is a compression. Just like when u bend a eraser, there will be a tension on top, but compression below

Thanks man,super example.

 

[periyasamy]

Hai guys,need help here.
My question is if question ask maximum kinetic energy than it is in positin2 ,rite?Thank u.....

 

[smoothieoeek]

plz help

 

[smoothieoeek]

and this plz~

 

[periyasamy]

plz help

plz help

cant open your document.

 

[1357911]

http://freeexampapers.com/index.php... Level/Physics/CIE/2008 Nov/9702_w08_qp_5.pdf
Q-2 part d and e???

 

[smoothieoeek]

cant open your document.

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_12.pdf
ok Q11 & 12

 

[smoothieoeek]

Hai guys,need help here.
My question is if question ask maximum kinetic energy than it is in positin2 ,rite?Thank u.....

Yea it is position 2

 

[periyasamy]

Yea it is position 2

Thank u.

 

[periyasamy]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_12.pdf
ok Q11 & 12

I think for question 11,the for both has same reaction force as the weight for the both objets r same.While for the tension thing, I am not sure.Hope someone else here give a hand.
For the second question,some one else explanation ---- first... since applied force is constant, the torque (F*d) will be proportional to d.... torque for 100mm is 3.. so for 150mm , it will be 4.5Nm... so we have to look for the tensions now..torque is the product of force and moment arm.. and the only force present here is the tension in the belt so 3=F*.1 F=30N
for the other wheel, 4.5=F*.15 F=30... so total force is equal to 30N to 30N = 60N...

 

[Jaspreet Dhaliwal]

Hi guys can u please help?

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_13.pdf QUESTIONS 10, 28
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_12.pdf QUESTIONS 18,23,24,29
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w10_qp_12.pdf QUESTIOn 26,33
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_13.pdf QUESTION 18,

Sorry for all questions but im not the smartest at physics ,rregret taking it this year :/ Please help ASAP, it will also be help for you guys too!

 

[periyasamy]

Guys need help here.In this question i get it that the panel 1 and 3 is series together n parallel to 2 ,4.That can be seen by imagining the whole diagram as a circuit.But i dont get it why in option d has a resistor fortm object between points 1 and 3...Thank u.

 

[periyasamy]

Hi guys can u please help?

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_13.pdf QUESTIONS 10, 28
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_12.pdf QUESTIONS 18,23,24,29
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf QUESTIOn 26,33
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_13.pdf QUESTION 18,

Sorry for all questions but im not the smartest at physics ,rregret taking it this year :/ Please help ASAP, it will also be help for you guys too!

For the question 10)---w-t=ma,,,,,,((120-90)9.81)=200a
a=2
v2=u2+2as
substitute in acc value,use the formula,,,,,,u willl get answer.

For question 28----------------------direct one,,,,,,just use the formula n*lamda=dsin theta
maybe u r confused with the angle,must make sure its half of 70 degree n diffraction grating is given.