Physics: Post your doubts here!

[Wolfgangs]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_11.pdf
Q20

 

[Asad Moosvi]

Got a quick question. How many significant figures should a percentage uncertainty have? (in paper 3, practical)

If I have an absolute uncertainty of 0.1 cm and the reading is 2.5 cm, how many significant figures should the percentage uncertainty have?

 

[Asad Moosvi]

Got a quick question. How many significant figures should a percentage uncertainty have? (in paper 3, practical)

If I have an absolute uncertainty of 0.1 cm and the reading is 2.5 cm, how many significant figures should the percentage uncertainty have?

 

[Asad Moosvi]

Got a quick question. How many significant figures should a percentage uncertainty have? (in paper 3, practical)

If I have an absolute uncertainty of 0.1 cm and the reading is 2.5 cm, how many significant figures should the percentage uncertainty have?

 

[26697luj]

as far as i know,you should keep all readings to the same significant figures..in this case to 0.1 dp.
any hints for last 8 marks in paper 3?

 

[Thought blocker]

Use the equation of motion s = ut + 0.5at^2
Now substitute the data into the equation
For XY
S= 40
t=12
u=??
a=??

equation 1 : 40 = 12u + 72a

For the X to Z
S= 80
t= 18
a=??
u=???
equation 2 : 80 = 18u + 162a
Why not I use the distance Y to Z is that it unitial velocity is different from that of X to Y
Now use simultaneus equation to get the answer..

Yeah, did it the same way..

 

[Hijab]

I solved that even, link please so that I can copy my solution
Time is money.

I solved the question.... Actually i read the question incorrectly sorry

 

[doremon]

TIPS AND TRICKS for tomorrow's physics prac :/

 

[Thought blocker]

TIPS AND TRICKS for tomorrow's physics prac :/

Physics Practical Tips
and :¬

 

[Hijab]

Can u also explain this question to me? Thought blocker ??? If u have time

 

[Thought blocker]

Can u also explain this question to me? Thought blocker ??? If u have time

Answer is D ?

 

[Hijab]

Answer is D ?

No its C

 

[Thought blocker]

No its C

Link dedo

 

[DeViL gURl B)]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_35.pdf

Guys please explain question 2 (b)(vi)
PLEASE EXPLAIN!!!
Help NEEDED!
Thank you

 

[Hijab]

Link dedo

U mean link of paper???

 

[Hadi Murtaza]

Can u also explain this question to me? Thought blocker ??? If u have time

It cannot b A becuz minimum momentum needed 2 stop da ball is 2mv
If it wuz B den da ball wud stop at da wall becuz all momentum wud b removed.
D is wrong becuz momentum is conserved here
C is correct becuz inital p = 2mv , final p = mv , so da ball has lost momentum but it still rebounded

 

[Thought blocker]

U mean link of paper???

yup

 

[Wolfgangs]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_11.pdf
Q20

 

[Thought blocker]

It cannot b A becuz minimum momentum needed 2 stop da ball is 2mv
If it wuz B den da ball wud stop at da wall becuz all momentum wud b removed.
D is wrong becuz momentum is conserved here
C is correct becuz inital p = 2mv , final p = mv , so da ball has lost momentum but it still rebounded

How Pf = mv ?

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_11.pdf
Q20

Use 0.5 * m * V^2
so 0.5 * 800000 * 50^2 = C