Physics: Post your doubts here!

[umair1161]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_12.pdf

q 12 please!

Thanks in advance!

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_12.pdf
Question 23 someone please help

 

[ashcull14]

is it

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_12.pdf
Question 23 someone please help

B?

 

[umair1161]

Look i did a calculation mistake it should be a = 0.2g that is a = 2

Well done again sir! thanks a lot!

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w13_qp_12.pdf

q 12 please!

Thanks in advance!

What you don't get in this ?

 

[Thought blocker]

Uffo, ye tou easy tha Thanks a lot!
Help me with Q31 of http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_13.pdf
too,please?

Same question, what do you think answer will be ?

 

[ParulS]

June 2003
Q 30

Can someone solve it and explain also

Thanks in advance

 

[umair1161]

What you don't get in this ?

I did the question... and i got the answer as C .....but the answer is D even though the ball had been thrown towards the left!

 

[ashcull14]

June 2003
Q 30

Can someone solve it and explain also

Thanks in advance

1 mA = charge flow of 1mC per sec

Av current = ½(100+ 20) mA = 60 mA = 60 mC/s

Net charge = 60 mC/s x 8.0s .. .. ►q = 480 mC

 

[omeraz]

is it

B?

Yesss, how?

 

[MaboroshI_I]

A few more questions, if somebody could please help me out.

 

[Shaoli Hassan]

[quote="

Please solve View attachment 45275[/quote]
The answer is B.

the edge of the circular scale is somewhere after 3.5 mm. The datum line coincides with 31 on the circular scale.
So, diameter= 3.5+(31*0.01)
=3.81 mm

So, area = (pi)(3.81)(0.25)
=11.4

 

[ashcull14]

 

[ashcull14]

Yesss, how?

area of model=1/10 area of full size ...stress=F/A....S1A1=S2A2...solve it u get the ans

 

[Shaoli Hassan]

A student uses a digital ammeter to measure a current. The reading of the ammeter is found to
fluctuate between 1.98 A and 2.02 A.

The manufacturer of the ammeter states that any reading has a systematic uncertainty of ± 1 %.

Which value of current should be quoted by the student?
A (2.00 ± 0.01) A
B (2.00 ± 0.02) A
C (2.00 ± 0.03) A
D (2.00 ± 0.04) A

How is the answer D?

The readings fluctuate and the uncertainty is 1%. So, the lowest value should be (1.98-(1.98*1%))=1.96. The highest value should be (2.02+(2.02*1%))=2.04. So the current value should be quoted as in D.

 

[ashcull14]

A few more questions, if somebody could please help]
Q24..F=kx...e=1/k...therefore,
A=greater e as more layers reduce the value of k
B=more springs per unit area increase the value of k hence dsnt hve adesired effect.......

 

[Thought blocker]

Gotta go!!! Sorry... I can't help now... coz I dont wanna study now ._.

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

 

[Batguy]

please :'(

PLEASE DO IT :/

 

[ashcull14]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w03_qp_1.pdf

Q15 why not D?
q16 with full explanation
Q17
Q32
Q33
Q40

Q15=a is always in the direction of the resultant force...eg if the resistive force is greater than the velocity the object will decelerate..which means the direction of a is opposite to the direction of velocity