Biology; Chemistry; Physics: Post your doubts here!

[luckywang]

Need help... Question 5???
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_w04_qp_1.pdf

answer is D? the wheel is turning to right so friction is acting to the left?

 

[luckywang]

explain Q9(v): why are the forces added?
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_w11_qp_21.pdf

because it wan upward force? mean the answer is resultant + Weight? if just resultant the rocket is unable to move? too heavy?

 

[Dukeofwin]

Take out the resistance of all three tht would be 7/4 now by formula u have to divide 4/7 t would be 0.57 !

Oh yeah! I forgot about the reciprocal part! THANKS

 

[NIM]

Guys need help!!!
What is d difference between Galvanometer and ammeter????

 

[Dukeofwin]

A, use the formula 1/R = 1/R1 + 1/R2 + 1/R3

I got 7/4 but forgot about the reciprocal part! Thnx

 

[luckywang]

Guys need help!!!
What is d difference between Galvanometer and ammeter????

i not sure too.... it dont think it is important... just know galvanometer is used to check the direction current flow while ammeter is check the total current in the circuit?

anyone can post the note of circular motion? if no, tell me the principle pls.... thanks!

 

[Dukeofwin]

Guys need help!!!
What is d difference between Galvanometer and ammeter????

A Galvanometer just SHOWS the presence of Current while,
A Ammeter also tells the VALUE of the current!

 

[luckywang]

A Galvanometer just SHOWS the presence of Current while,
A Ammeter also tells the VALUE of the current!

galvanometer is shows the presence of current? i tot is show the direction of the current...

 

[Dukeofwin]

galvanometer is shows the presence of current? i tot is show the direction of the current...

It shows the presence with the direction!

 

[luckywang]

It shows the presence with the direction!

oh... thanks!

 

[NIM]

What is the function of
i) Carbon brushes
ii) Split rings

 

[NIM]

A Galvanometer just SHOWS the presence of Current while,
A Ammeter also tells the VALUE of the current!

thnx dude!!!

 

[luckywang]

What is the function of
i) Carbon brushes
ii) Split rings

carbon brushes=conduct electricity when turning
split rings= reverse the current every half turn...

 

[NIM]

carbon brushes=conduct electricity when turning
split rings= reverse the current every half turn...

thnx dude!!!

 

[NIM]

Explain the types of Transformer!!!

 

[Dukeofwin]

Explain the types of Transformer!!!

1. Step-up Transformer: In which the coils on the primary coil are less than the secondry
2.Step-down transformer: In which the coils in the primary coils are more than secondry

 

[NIM]

1. Step-up Transformer: In which the coils on the primary coil are less than the secondry
2.Step-down transformer: In which the coils in the primary coils are more than secondry

Where do v use them!!!

 

[NIM]

Can some1 give me example of D.C and A.C current and also tell me wher do v use dem

 

[NIM]

i not sure too.... it dont think it is important... just know galvanometer is used to check the direction current flow while ammeter is check the total current in the circuit?

anyone can post the note of circular motion? if no, tell me the principle pls.... thanks!

May be it will help u

Ways to increase e.m.f in an A.C Generator:​

1. Decrease distance between the magnet and coil.
2. Use stronger Magnet
3. Increase the speed of moving the magnets
4. Increase no. of turns on the coil.

​

Question: Describe theprocess/operation of the A.C Generator ​

1. Turn the wire.
2. The wire cuts through the magnetic field as it turns.
3. This produces an induced emf.
4. Because of the load, an induced current is produced.

 

[amna shah]

http://www.xtremepapers.com/papers/...onal O Level/Physics (5054)/5054_w09_qp_1.pdf

Explain mcq 8 ... how the center of mass was determined ?