Physics: Post your doubts here!

[Thought blocker]

View attachment 44893

0.7 m ----> 1.1V
0.9m ----> ?
? = 1.4V = D

 

[Thought blocker]

help plzzz..
m/j12/13 q-10
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_13.pdf

10)
Consider barrel :
Use F = ma
That is mg - T = ma (T = tension): 120g - T = 120a
Make T the subject of formula so, later we can equate it in other equation or you can solve it by simultaneous equation method also.
But I personally go for Equate so, T = 120g - 120a

Consider stake :
Again use F = ma
so T = 80g + 80a

Equate it to get acceleration :
120g-120a=80g+80a
a=0.5g

Now we use V² - U² = 2as
so V² = 2 x 0.5 (10) x 9
V = 6m/s

 

[Thought blocker]

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I did it like this, on the first sight

 

[Thought blocker]

Whoa, more questions that answers
If anyone could help out!
q3 of
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_11.pdf

Please and thank you!

3)
Maximum Height :
The maximum height is reached when the velocity is equal to zero
t(h) = vsinθ / g
where t(h) stands for the time it takes to reach maximum height. From the displacement equation we can find the maximum height
h = (vsinθ)² / 2g

 

[Thought blocker]

Question 22.

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_12.pdf

22)
Basically, here they asked us to find volume of the crystal (cube), and then we are asked to find its length i.e is 3rd root of volume :¬
Find V from V = m / ρ and 3rd root (V) you'll get the answer

 

[Asad Moosvi]

22)
Basically, here they asked us to find volume of the crystal (cube), and then we are asked to find its length i.e is 3rd root of volume :¬
Find V from V = m / ρ and 3rd root (V) you'll get the answer

But isn't this the length of one atom? We are asked to find the distance between two atoms. I don't understand what they're asking.

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_1.pdf
question 14 please!!

14)
moment = force x distance
clockwise moment = anticlockwise moment
W x a + F x h = W x 2a
(easy tha, koi elaboration chahiye to bolna )

 

[Thought blocker]

But isn't this the length of one atom? We are asked to find the distance between two atoms. I don't understand what they're asking.

 

[Asad Moosvi]

View attachment 44898

So the shortest distance is basically the length of one atom? Why?

 

[Asad Moosvi]

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I still don't get it!

 

[Asad Moosvi]

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Did you use the mass that was given? If so, why? There is more than 1 atom in the cube...

 

[Thought blocker]

So the shortest distance is basically the length of one atom? Why?

I still don't get it!

Did you use the mass that was given? If so, why? There is more than 1 atom in the cube...

We are asked to find the length b/w any two atoms...

 

[Ahmed H. Al-Neel]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w08_qp_1.pdf
question 21 please.

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w08_qp_1.pdf
question 21 please.

 

[Asad Moosvi]

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

Question 38.

May someone explain how the resistances add up in the second circuit?

 

[Ahmed H. Al-Neel]

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broo wrong question i said 21 xD

 

[Thought blocker]

broo wrong question i said 21 xD

Okay so this problem is like parallel and series circuit. just imagine extension as resistors, and if you want overall k then find inverse of overall x. or otherwise the otherway if parallel then k would all add up for overall k. You do it yourself now and see if you got correct

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_12.pdf

Question 38.

May someone explain how the resistances add up in the second circuit?

 

[Ahmed H. Al-Neel]

Okay so this problem is like parallel and series circuit. just imagine extension as resistors, and if you want overall k then find inverse of overall x. or otherwise the otherway if parallel then k would all add up for overall k. You do it yourself now and see if you got correct

thank youuu sooo much again! i got the answer

 

[Asad Moosvi]

Thank you so much!