Physics: Post your doubts here!

[Salman917]

When you are relating forces, you use mv^2/r because centripetal F = mv^2/r and Gravitational F = GMm/r^2
When you are relating energies, you use 1/2mv^2 because (K)E = 1/2mv^2 and GPE = -GMm/r (You don't equate the 2 though, usually)

Thanx a lot!

 

[BreakingBad]

can someone pls help me out with a few questions of phy A2.....
1. M/J/06 P4 q2 b(ii)
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_4.pdf

2. O/N/07 P4 q3 b(ii) 2
how can we use the graph in this question...i got the answer by using the formula KE=1/2mw2 A2...but i dont know how to use the graph..???
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_4.pdf

3. O/N 06 P4 q7 b
what i know is that frequency of light hv no effect on the rate of emission of electrons.... rate only depends on the intensity of light.... n here light intensity is constant.... so how does the rate decreases..???? n how the photons r fewer per second at higher frequency ???????
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w06_qp_4.pdf

4. M/J/09 P4 q9 b
can someone pls explain why the source must decay by 8% ???
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_4.pdf

pls someone do help..!!!

Physics' links please

 

[AbbbbY]

can someone pls help me out with a few questions of phy A2.....
1. M/J/06 P4 q2 b(ii)
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s06_qp_4.pdf

2. O/N/07 P4 q3 b(ii) 2
how can we use the graph in this question...i got the answer by using the formula KE=1/2mw2 A2...but i dont know how to use the graph..???
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_4.pdf

3. O/N 06 P4 q7 b
what i know is that frequency of light hv no effect on the rate of emission of electrons.... rate only depends on the intensity of light.... n here light intensity is constant.... so how does the rate decreases..???? n how the photons r fewer per second at higher frequency ???????
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w06_qp_4.pdf

4. M/J/09 P4 q9 b
can someone pls explain why the source must decay by 8% ???
link = http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_4.pdf

pls someone do help..!!!

You do realize that you've linked Bio papers in a Physics thread, right?

 

[mahabaloch]

first find the initial energy stored in the capacitor using the initial voltage...
E=1/2 CV^2
E=1/2 x 220 x 10^-6 x 15^2
E=0.02475 J
since half of this energy is lost so only half is left behind
so divide this energy by 2 to get half of it
E=0.012375 J
now with this left over energy find the voltage using the same above formula
E=1/2 CV^2
0.012375=1/2 x 220 10^-6 x V^2
V=10.6 V ...
hope u get it ..

Thank u

 

[Cute Angella]

ooo m so sorry... actually i was solving bio past papers.. n didn't realize that by mistake i linked that to phy...
now i hv changed the links... sorry once again....

 

[Cute Angella]

Thank u

ur welcome..

 

[Hassan Ali Abid]

1357911
just have a look on it ....

 

[♫Prince Shah♫]

solve your electronics concept here... PDF... FOR AS LEVEL>..!!!!!!!!!
https://www.xtremepapers.com/commun...ot-information-here-you-go-for-a-pdf-p.31612/
All the best...

 

[♫Prince Shah♫]

solve your electronics concept here... PDF... FOR AS LEVEL>..!!!!!!!!!
https://www.xtremepapers.com/commun...ot-information-here-you-go-for-a-pdf-p.31612/
All the best...

 

[♫Prince Shah♫]

electronics concepts "here"

 

[Lama AN]

Please can someone give me a structured answer for question 6 past paper 2 NOv 2008 ?
PLEASE FOR TOMRROW

 

[hellangel1]

View attachment 34458 View attachment 34457

Thanku

 

[snowbrood]

does anyone knows where are physiucs coursebook answers these were uploaded recently but i cant find the link thanbsk

 

[♫Prince Shah♫]

does anyone knows where are physiucs coursebook answers these were uploaded recently but i cant find the link thanbsk

facing same prob/

 

[TheStallion-Reborn]

Where do we have 'projectile motion' in our syllabus? as in under which unit?

 

[TheStallion-Reborn]

any good books that can ultimately make a difference if consulted?

 

[snowbrood]

https://www.xtremepapers.com/commun...chapter-questions-exam-style-questions.31352/ there u go people answers to physics coursebook

 

[TheStallion-Reborn]

Where do we have 'projectile motion' in our syllabus? as in under which unit?

any good books that can ultimately make a difference if consulted?

Help me out peeepaal!!

 

[snowbrood]

why is answer A

 

[snowbrood]

Help me out peeepaal!!

physics coursebook i am an A2 student believe me without this u are goin no where