AS Physics P1 MCQs Preparation Thread.

[bloody_mary]

Initial KE = 2 * final KE ( because the ball rebounds to half its original height)
So, 1/2*m*u^2 = 2*1/2*m*v^2
1/2*m*u^2 = m*v^2
Rearrange in the form v/u and you get 1/(root) 2

thanks a lot :')

 

[lavanyamane]

thanks a lot :')

After all the times you've swooped in and saved me from going insane, no problem

 

[MysteRyGiRl]

Initial KE = 2 * final KE ( because the ball rebounds to half its original height)
So, 1/2*m*u^2 = 2*1/2*m*v^2
1/2*m*u^2 = m*v^2
Rearrange in the form v/u and you get 1/(root) 2

can u explain a bit? y did u multiply by 2 when it was half hieght? :S

 

[KurayamiKimmi]

haha easy. spending time and short tempering will not help. its the game of concept

see in 13th mcq. you should recall that torque of a couple is one of the force into perpendicular distance between the two same forces. means F into 1.20 = 900 into .20 , this will give you force 150 N i.e the very dear and sweet B option!
for the minimum force to be applied we need to get same torque below and on the spindle in order to create rotation effect so that the poor weight can be lifted

15th: height decreases by 2 in both containers. pressure reduces by 4 times altogether...no convincing answer available at the moment.

thanks for ur help ^^

 

[bloody_mary]

Questions 25 + 31 please
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s11_qp_11.pdf
http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s11_ms_11.pdf

 

[bloody_mary]

can u explain a bit? y did u multiply by 2 when it was half hieght? :S

final ke is half intial right?
so in order for final ke to equal intial ke you must remove the 0.5 by multiplying by 2

 

[MysteRyGiRl]

Questions 25 + 31 please
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_ms_11.pdf

for 35 use da formula (2n-1)*75 so for first higher note it will be (2*2)-1=3*75=225
lykwise for da nxt note
hvnt done da nxt yet

 

[bloody_mary]

for 35 use da formula (2n-1)*75 so for first higher note it will be (2*2)-1=3*75=225
lykwise for da nxt note
hvnt done da nxt yet

wait what formula is this??

 

[hm12]

initial momentum of the ball is 2mv before collision... if collision was perfectly elastic one, all the momentum would have been gained by the ball... and this would have made the change in the momentum equal to 4mv.. 2mv-(-2mv)... now it is given that collision is inelastic, it wil losse some of its momentum to the wall.. so now change in momentum will be less than 4mv but cant be less than the initial momentum... so the answer is C.. i think you cannot verify the answer by the calculations...

oh okay thanks a lot

 

[omg]

Questions 25 + 31 please
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_11.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_ms_11.pdf

for q.31, find the charge dats 10x1 = 10C
now divide it by 1.6x10^-19 to find the no. of electrons

 

[lavanyamane]

can u explain a bit? y did u multiply by 2 when it was half hieght? :S

KE = o.5*m*v^2 , so if the height is halved, so is the velocity and also the KE.

 

[MysteRyGiRl]

wait what formula is this??

for 1 closed end we use (2n-2)c/4l ryt? but we wont use l here and just da upper part...

 

[bloody_mary]

for 1 closed end we use (2n-2)c/4l ryt? but we wont use l here and just da upper part...

wasn't even taught this thanks ♥

 

[bloody_mary]

for q.31, find the charge dats 10x1 = 10C
now divide it by 1.6x10^-19 to find the no. of electrons

thanks a lottt

 

[MysteRyGiRl]

wasn't even taught this thanks ♥

np just plz pray 4 a gud ppr

 

[bloody_mary]

for 1 closed end we use (2n-2)c/4l ryt? but we wont use l here and just da upper part...

so c is frequency right?
and what about open end?

 

[omg]

q.36

 

[omg]

so c is frequency right?
and what about open end?

this myt help

 

[bloody_mary]

this myt help

thanks ♥

but the problem my wonderful teacher never taught us that

 

[omg]

thanks ♥

but the problem my wonderful teacher never taught us that

i dun think its specifically mentioned in the syllabus!!
O lvl stuff