Physics: Post your doubts here!

[Shuddho Ukil]

Help please?
Need help with question number 2 c (ii) from paper 22 of summer 2012.
I've attached the question.
Would highly appreciate any help. Thanks!

 

[Bishnu Dev]

Help please?
Need help with question number 2 c (ii) from paper 22 of summer 2012.
I've attached the question.
Would highly appreciate any help. Thanks!

The Potential Energy of the ball when it is at A changes to Kinetic Energy as the ball accelerates downwards (It's velocity increases, so KE also increases). After the ball hits the ground, it rebounds upwards with decreasing velocity and increasing height, so KE changes to Potential Energy.

 

[Bishnu Dev]

see solution 120 at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-22.html

It's not clearly explained. Why doesn't the current flow through Q?

 

[Salim Dridi]

Al Salamou alaikom,
What is the number of Decimal Places to put our answer for VOLTAGE to in Paper 3 Practical when we put the Voltmeter/Multimeter to the 20V setting.
P.S. in the multimter, when we put setting to 20V, it gives us a reading with 2 d.p. i.e. 5.36 V so should we put our answer to 1 or 2 or no d.p.

 

[Shuddho Ukil]

The Potential Energy of the ball when it is at A changes to Kinetic Energy as the ball accelerates downwards (It's velocity increases, so KE also increases). After the ball hits the ground, it rebounds upwards with decreasing velocity and increasing height, so KE changes to Potential Energy.

Thanks!

 

[i_try9621]

Al Salamou alaikom,
What is the number of Decimal Places to put our answer for VOLTAGE to in Paper 3 Practical when we put the Voltmeter/Multimeter to the 20V setting.
P.S. in the multimter, when we put setting to 20V, it gives us a reading with 2 d.p. i.e. 5.36 V so should we put our answer to 1 or 2 or no d.p.

better if you use 5.36V

 

[i_try9621]

Someone please help me with 6) iv). It's from 41/O/N/11

 

[Thought blocker]

View attachment 61960 View attachment 61961 Someone please help me with 6) iv). It's from 41/O/N/11

Zero

 

[i_try9621]

Zero

but why?

 

[Thought blocker]

but why?

Mean voltage so.. xD

 

[krishnapatelzz]

Mean voltage so.. xD

 

[Albeit]

Can someone please find the uncertainty in logP when P(20.5+-0.5).Many thanks in advance..

 

[i_try9621]

Can someone please find the uncertainty in logP when P(20.5+-0.5).Many thanks in advance..

Two ways of doing it
log(20.5 + 0.5)-log(20.5) = 0.01
OR
log(20.5)-log(19) = 0.01
both ways can be done

 

[Holmes]

see solution 129 at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-24.html

thank you bro....

 

[Bishnu Dev]

Please answer me the iv question.... I tried to solve it but the answer that i got is twice the actual answers. i got Vb = 866 but the answer is 433... and For Va the answer is 250 and i got 500... Please tell me what's missing....

 

[student2]

see solution 120 at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-22.html

Cn u pls help with p5 2?

Edit: actually i jst want 2 knw hw 2 draw the graph fr mj 2011 51 pllss..

 

[Ogapatapata]

can someone explain to me why Y=2

 

[Thought blocker]

can someone explain to me why Y=2
View attachment 61980

I have shown neutron representation and made equation to solve for y.

 

[Ogapatapata]

Thanks i forgot add the 1 from the neutron.
God bless.

 

[nadeen64]

in paper 5, when i want to draw a hall probe in the diagram for question 1.. do i draw a rectangular block as the hall probe or something like this?