Biology; Chemistry; Physics: Post your doubts here!

[Mayedah]

my mistake.... sorry...

Its ok

 

[khizer shahab]

Physics question:​

okay i think this is simple but am kinda confused: ​

​

3bii.) - i don't get why to calculate the time only the vertical distance is considered​

3biii.) - why do we use the horizontal velocity to calculate the speed.....and the time is the same as the journey of the ball before colliding with the wall?? ​

​

Question paper: http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_21.pdf​

Marking scheme:http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_ms_21.pdf​

​

please help urgently thanx so much.....May God bless you​

hello friend you are on the wrong road !!!! refer to Alevel section !!!

 

[luckywang]

help me on these?
describe the use of magnetic materials in audio/video tapes.
discuss the dating of objects by the use of 14C.
describe how the Geiger-Marsden alpha-particle scattering experiment provides evidence for th nuclear atom.

somebody help me!

 

[Mayedah]

also for 29 pls

Option C switch no 5 !

 

[kitecrystal]

U have to use right hand rule to work out the direction of magnetic field of each wire. Always remember parallel wires carryin current in opposite direction always repel each other because their magnetic fields are opposite.

thanks and why option c is correct rather than d,..i mean,both have opposite direction of current and repel each other??

 

[Soldier313]

hello friend you are on the wrong road !!!! refer to Alevel section !!!

hey yeah lol i figured

 

[syed1995]

Yes it A !

But what will be the logical approach to that microwave question?

 

[convent2012]

http://www.xtremepapers.com/papers/...nal O Level/Physics (5054)/5054_s10_qp_12.pdf
7 ?

 

[Fallen316]

hey, please somebody name and EXPLAIN the 3 types of fission reactions.
1. is the chain reaction
2. ?
3. ?

 

[Fallen316]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_12.pdf
7 ?

15*60=30x
x=30N
W/g = m
30/10 = m
m = 3kg
option B

 

[syed1995]

When travelling away from a denser medium lights refracts towards the normal or away from the normal .. and what happens in the vice versa scenario ?

 

[Mayedah]

But what will be the logical approach to that microwave question?

Btw which past year question is this ?

 

[Dashing Cancerian]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_12.pdf
7 ?

fxd=fxd
so, 30 x weight=(30+30) x 15
weight=60 x 15/30
=30 N now change it to mass by W=mg
30/10= 3 kg

 

[luckywang]

15*60=30x
x=30kg
option C

is B? x is 30N, mass is 3kg..

 

[Mayedah]

When travelling away from a denser medium lights refracts towards the normal or away from the normal .. and what happens in the vice versa scenario ?

D because it is travelling perpendicularly ?it should have not bend but it id !

 

[bogus]

When travelling away from a denser medium lights refracts towards the normal or away from the normal .. and what happens in the vice versa scenario ?

d cuz if light perpendicularly strikes a surface it doesnt bend

 

[luckywang]

When travelling away from a denser medium lights refracts towards the normal or away from the normal .. and what happens in the vice versa scenario ?

D...the ray is perpendicular why still bend?

 

[Mayedah]

But what will be the logical approach to that microwave question?

Its a fact

 

[bogus]

syed1995 u have 3 answers

 

[Fallen316]

is B? x is 30N, mass is 3kg..

post edited
free advice: always read the question ( at least once )