Physics: Post your doubts here!

[aleezay]

Can someone please answer

For Q3d(i) and (ii) use v= u + at.... You should get the answer..
Q6(b) draw every point on the wave at the same position with respect to y-axis... but 20cm (.25 of wavelength) before the original position

 

[goodluckayesha]

Can someone please tell me how to find the time in Summer 11/paper 2/ variant 3/ Q- 3 -Di !! The ms only gives the answer not the way ! am completely stuck !
Also, in the same paper, how to do Q6-b ?? how to solve it and know where to start the sketch of the wave ?

Thank you, please answer as soon as possible !

1. a=v-u/t a=0.57 v=2 u=0 so t=v-u/a 2-0/0.57 =3.5
2. a=0.3 v=0 u=2 t=-2/0.3 = -6.67s

 

[Moi]

1. a=v-u/t a=0.57 v=2 u=0 so t=v-u/a 2-0/0.57 =3.5
2. a=0.3 v=0 u=2 t=-2/0.3 = -6.67s

Thank you !! What abt my other question abt the wave...do u happen to know it ?
Thx again

 

[MustafaMotani]

How can I send it? I have waves note but it does not intensely cover the Lights portion.

thanX

 

[Beaconite007]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_22.pdf
Q5 part (b) please :C

 

[beewhiz997]

SOMEBODY HELP! can someone explain the head and tail rule, and also how to find the frequency of a wave using CRO!

 

[daredevil]

SOMEBODY HELP! can someone explain the head and tail rule, and also how to find the frequency of a wave using CRO!

join the arrows of the forces given in a way that they are scaled and in the right order of movement and then draw a third arrow (resultant) from the tail of the first arrow to the head of the second one.... just like u do in vectors

 

[daredevil]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_22.pdf
Q5 part (b) please :C

solve this one guys MustafaMotani and A star

 

[A star]

solve this one guys MustafaMotani and A star

:O

 

[A star]

me off guys best of luck and MustafaMotani do it

 

[daredevil]

me off guys best of luck and MustafaMotani do it

hahaha chicken xD
okaayss... this question 'ne meri phoonkain nikaal di hain' X|

 

[A star]

haha u so brave u do it

 

[beewhiz997]

join the arrows of the forces given in a way that they are scaled and in the right order of movement and then draw a third arrow (resultant) from the tail of the first arrow to the head of the second one.... just like u do in vectors

and the cro?

 

[A star]

how to convert unit MeV into Joule syed1995 daredevil MustafaMotani

 

[Buzzkiller]

m

how to convert unit MeV into Joule syed1995 daredevil MustafaMotani

multiply the value in MeV with ten raise to the power six and 1.6 into 10 raise to the power minus nineteen. (charge of an electron)

 

[Buzzkiller]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w12_qp_21.pdf
Question four part b (i).Please explain the nswers after giving them .

 

[gary221]

Yes, I do get the electrical potential energy part.
Although, I'm not sure when to use both masses as in GMm/r or to just use one mass as in GM/r. Sometimes, when planets are involved they just want you to use one mass.
But thank you so much. It helped a lot and Jazak Allahu Khairan.

u use both masses when they tell u to calculate potential ENERGY
u use 1 mass when they tell u 2 calculate potential.

remember : potential = potential energy/ mass

 

[Buzzkiller]

u use both masses when they tell u to calculate potential ENERGY
u use 1 mass when they tell u 2 calculate potential.

remember : potential = potential energy/ mass

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w12_qp_21.pdf
Question four.Part b. (i). Please explain the answers a little bit too.

 

[gary221]

Here, you calculated energy as 1.51 x 10^-47 Joules but isn't that the gravitational potential, not energy. Because then to get energy you would need to multiply this energy by a mass. Right? And what's the difference between electric potential and electrical potential energy?

No, it would have been gravitational potential if I had used only mass of α nucleus. [potential = GM/R]
but since i used both the masses, it is gravitational potential ENERGY

diff btw electric potential energy n electric potential is the same
electric potential = electric potential energy / charge

 

[A star]

m
multiply the value in MeV with ten raise to the power six and 1.6 into 10 raise to the power minus nineteen. (charge of an electron)

thankyou

 

[ASAD1214]

Can some one please post the physics formula sheet here...
Also is its possible can some one please explain uncertainity and it's usage by formula