Physics: Post your doubts here!

[mistique_bee]

Yeahh.

dont be so rude...i'll get u one...on 4th may :3

 

[Copy Cat]

 

[mistique_bee]

oct/nov 2014 p21 ques 6 part b ii

 

[ahmedish]

The magnitude of attractive magnetic force between the wires depends on the product of the currents and inversely on the distance between these two currents....product of currents = I^2 = sinosoidal and in phase ...thus f of the force varies by 2f of the current

wouldn't it be just sin^2(X) at the same frequency?
Why did it become twice the frequency?

 

[Saad the Paki]

View attachment 60415
oct/nov 2014 p21 ques 6 part b ii

R = V/I
I is 1.2 A
V is 12V
Find the total resistance from this which comes out to be 10 ohms
Now total resistance = resistance of X + resistance of Y + internal resistance
10 = 6 + Y +0.5
Y = 3.5 ohm
the resistance of X is found from the graph.

 

[sid2333]

Please help me with Q11(b)iii
http://papers.gceguide.com/A Levels/Physics (9702)/9702_w14_qp_43.pdf

 

[Saad the Paki]

Can someone tell me if this graph for a thermistor is correct?
Shouldn't it be like this?

 

[TariqBhai]

Can someone tell me if this graph for a thermistor is correct?View attachment 60441
Shouldn't it be like this?
View attachment 60442

You are correct.

 

[TariqBhai]

Part C
Rizwan Javed

 

[Rizwan Javed]

Part C
Rizwan Javed

Is this related to AS or A2?

 

[TariqBhai]

Is this related to AS or A2?

Circular Motion A2

 

[Rizwan Javed]

Circular Motion A2

Sorry, then I can't help since I'm doing AS
May be anyone else can help.

 

[TariqBhai]

Sorry, then I can't help since I'm doing AS
May be anyone else can help.

Can you tag someone you know?

 

[Rizwan Javed]

Can you tag someone you know?

Midnight dream My Name Physicist

 

[HumptyR]

R = V/I
I is 1.2 A
V is 12V
Find the total resistance from this which comes out to be 10 ohms
Now total resistance = resistance of X + resistance of Y + internal resistance
10 = 6 + Y +0.5
Y = 3.5 ohm
the resistance of X is found from the graph.

WHERE DID U GET THE TOTAL RESISTANCE FROM?

 

[Midnight dream]

Midnight dream My Name Physicist

I cant see the pic he just attached so pardon i cant help.

 

[Saad the Paki]

WHERE DID U GET THE TOTAL RESISTANCE FROM?

Total resistance = emf/current in circuit
R = 12/1.2 = 10 ohms

 

[ashcull14]

View attachment 60445

Part C

idk if im right but i solved it like this
Tcos0 = W
Tsin0 = Fc
Fc = 0.15*6.35^2/1.82 = 3.33N
make T the subject T= 1.47 / cos0
substitute it into Tsin0 = Fc
1.47/cos0 *sin0 = 3.33
tan0 = 3.33/1.47
0 = 66.0
Tcos66 = 1.47
T = 3.6..N

 

[Copy Cat]

Part C
Rizwan Javed

Can you help me with Part (a)?

 

[ashcull14]

Can you help me with Part (a)?

v = rw
w = 2πf
f = 10 / 18
= 2π(10/18) =3.49 m/s
v= 3.49 * 1.82 = 6.35 m /s