Question

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s11_qp_11.pdf Question 35

Answer 1

I believe it would be the 3rd one.

Answer 2

Correct, but how please?

Answer 3

YOU SEE that the three resistors are in parallel right?..

so voltage across all of them would be equal.. so you have to find what that voltage is..

Answer 4

The voltage will be 10/7 * 5

Answer 5

Then what should i do?

Answer 6

ok.. now the voltage is same across all the resistors

so using ohms law you will be able to find current across all the resistors

Answer 7

Will the ammeter only measure the current from the 2 ohms resistor?

Answer 8

has to right!?

Answer 9

Okay i could solve it already, but now i got a doubt in Question 9... please help!

Answer 10

its better if you could copy paste the question and open each one in a different forum.. instead of doing it this way :P.. its easier to keep track.. else everytime we have to click on the link and undergo the security check!

Answer 11

Hahaha this is the last doubt i have

Answer 12

A body of mass m, moving at velocity v, collides with a stationary body of the same mass and
sticks to it.
Which row describes the momentum and kinetic energy of the two bodies after the collision?

Answer 13

yea i saw it .. you tell me this.. if the two bodies stick together .. what will be the velocity of each one?

Answer 14

They will have the same velocity

Answer 15

yes but how much!?

Answer 16

Ummm... you tell me :p

Answer 17

nope :P..

ok tell me about momentum.. wat do you think will be the total final momentum of the two bodies together?!

Answer 18

(v)m+m=2mv ?

Answer 19

v(m+m)=2mv *

Answer 20

there is something called as conservation of momentum .. remember? :)

Answer 21

Yeahh

Answer 22

so initial momentum of the whole system (the two balls together)
was MV + 0 = MV

hence after the collision also the total momentum must remain the same MV itself..
so now can you find their common velocity?

Answer 23

Nope :p

Answer 24

whats the total mass after they stick togeter?!? TOTAL mASS??

Answer 25

2m

Answer 26

and now you know that the momentum has to be mv

so what shoudl be the velocity?

Answer 27

0.5v ?

Answer 28

Just please solve it fully and show me, then i will try to understand by myself