Physics: Post your doubts here!

[TaffsAsLevel]

sorry but i m nt still getting....wht 40=12v+72
frm which equation r u getting this?

from s=ut+o.5at^2 consider XY and XZ motion

 

[white rose]

from s=ut+o.5at^2 consider XY and XZ motion

plzzzz show me the working..i cant get the ans

 

[TaffsAsLevel]

plzzzz show me the working..i cant get the ans

Awwww, here

 

[Maira Siddique]

plzzzz show me the working..i cant get the ans

what hes saying is:
s=ut + 0.5at^2

so taking s=40 and t=12

40=12u + 0.5(a)(12)^2
40=12u + 0.5(a)(144)
40=12u + 72a

 

[Maira Siddique]

lolzz

 

[killer22]

Both questions please!
Answers are
17: A
18: B

 

[Sohail A. Razzak]

Can anybody tell me how to do ds question

 

[Aymen Ezazi]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_11.pdf
plz help me with these... 8, 12 , 13 , 15 , 17 , 18 ,24

 

[killer22]

View attachment 28828
Can anybody tell me how to do ds question

The micrometer is measuring the diameter. Half the reading and find area by pi x r^2

 

[Sohail A. Razzak]

The micrometer is measuring the diameter. Half the reading and find area by pi x r^2

Yes but could you tell me how to read the micrometer i mean wht to do with that 31 reading???
JazakALLAH khair an kaseer

 

[killer22]

Yes but could you tell me how to read the micrometer i mean wht to do with that 31 reading???
JazakALLAH khair an kaseer

Answer
Pi x (3.81 / 2) ^2

 

[Maira Siddique]

PLEASE help me with Q13 of :

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_12.pdf

 

[Sohail A. Razzak]

Answer
Pi x (3.81 / 2) ^2

Y is da answer not c but d???

 

[white rose]

Awwww, here

thanks a lot...it helped me...

 

[white rose]

what hes saying is:
s=ut + 0.5at^2

so taking s=40 and t=12

40=12u + 0.5(a)(12)^2
40=12u + 0.5(a)(144)
40=12u + 72a

thank u Maira...

 

[Aymen Ezazi]

View attachment 28828
Can anybody tell me how to do ds question

is the answer B??

 

[Adorkableme]

can someone please help me with Q 12,19,27,30,36 from Winter 2012 ...... http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_12.pdf

 

[Sohail A. Razzak]

is the answer B??

Yes it is

 

[Adorkableme]

can someone please help me with Q 12,19,27,30,36 from Winter 2012 ...... http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_12.pdf

 

[1597.2217]

Q4, 5, 15
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf

Q4-

LHS = RHS
The units must be cancelled out so that nothing remains. First, you cancel out all the constants:
L x 1/P = Q x T^2 [We know L is m and T is s]
m x 1/P = Q x s^2 [To cancel the s^2, Q must have s^-2]
Now substitute the units given in options:
(B) m x m^-2 = m x s^-2 x s
Giving m = m

Q5-

Basically what they are asking is to first find the PERCENTAGE UNCERTAINTY. Eg, for A- 0.002/2.043 x 100% gives 0.097%.
Find out for other options. You will see that B- has 3.7% and D- has 3.85%. But it doesn't end here. (B) is d, and in the equation the d is multiplied by d again. So multiply the uncertainty giving you value greater than (D).

Q15-

Total AC moment = Total C moment.
The rings are of same mass.
7xm + Yxm = 5x2m [Subs m as 1 for simplicity]
7 + y = 10
y = 3
[8 from pivot minus 3 = 5.]
Ans is hence (C)


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