Biology; Chemistry; Physics: Post your doubts here!

[khizer shahab]

Q6 bcuz thre is always a force towards the centre When ny object is moving in a circle so D

also for 29 pls

 

[kitecrystal]

U dnt have to use left hand rule in this u have to use right hand rule for current and direction of magnetic field !

em,but how?

 

[syed1995]

roll your pen on the floor and see its movement, although it would move forward it would be rotating in the opposite direction! that's why.

Best Example ever! Thanks alot .. got it .. so if its the tire itself the friction would be in the side where the car is accelerating!

 

[Dashing Cancerian]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_11.pdf

q6 with reason..
q 8 with explanation !! please
q13,q16,q28

Q 13....B 300 000 W as p= E/t
432 000 000 J/24*60
= 300000 W

 

[Mayedah]

http://www.xtremepapers.com/papers/...nal O Level/Physics (5054)/5054_s10_qp_11.pdf

q6 with reason..
q 8 with explanation !! please
q13,q16,q28

Qno 8 u have to multiply 15 x 60 because its the perpendicular force abt the pivot and thn divide it by 30 because tht is the distance about the pivot for weight now the weight will be 30. Divide it further by 10. ( gravitational field ) to get mass which is option B

 

[syed1995]

U dnt have to use left hand rule in this u have to use right hand rule for current and direction of magnetic field !

Don't we have to use fleming's left hand rule for finding the direction ?? :O

 

[convent2012]

I would go with A .. cuz of microwave oven .. is it correct? but what would be the logical approach?

i also think its A .

 

[Mayedah]

Q 13....B 300 000 W as p= E/t
432 000 000 J/24*60
= 300000 W

Its gonna be option A because u have to tale time in seconds as its the SI unit !

 

[Dashing Cancerian]

Its gonna be option A because u have to tale time in seconds as its the SI unit !

u sure...?? cox i was thinking the same... in a way

 

[Soldier313]

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​

 

[bogus]

Why is the friction force acting towards D instead of B??

remeber friction opposes direction of SLIDING on surface its sliding anticlockwise so d is the answer... remember the word sliding thats what my teacher told me

 

[Mayedah]

Don't we have to use fleming's left hand rule for finding the direction ?? :O

Not in this case its simple if dot thn current is going into the page so so direction of right hand thimb goes down and curl of fingers tell the direction of magnetic field M

 

[asd]

plz also explain how we can use left hand rule here in q33.

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.

 

[khizer shahab]

Its gonna be option A because u have to tale time in seconds as its the SI unit !

yes it should be !!

 

[Soldier313]

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​

Sorry:/ meant to post it in an a' level thread

 

[Mayedah]

u sure...?? cox i was thinking the same... in a way

Yes i am ure !

 

[syed1995]

By the amount of problems i am coming across .. i am pretty sure i will have 500 posts by night .. lol

 

[Dashing Cancerian]

Yes i am ure !

my mistake.... sorry...

 

[Mayedah]

i also think its A .

Yes it A !

 

[bogus]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s07_qp_1.pdf
39 ??

beta... use fleming left hand rule it should move to n if its conventional current but since its the opposite so beta which is opposite convential current ie proton. Beta is electron hope my answer satisfiies u?