Biology; Chemistry; Physics: Post your doubts here!

[Faizan Muhammmad]

View attachment 42969
m unable to do cro

from the knob you can see 2ms is represented by1 cm
a wave is 2 cm so time is 2x2 = 4

 

[Faizan Muhammmad]

how to apply Left hand rule here ? :'(

you can see force and magnetic field
you apply that
and you find current coming away, alpha are positive, conventional current is of positive so it is alpha

 

[Faizan Muhammmad]

they are inversely porpotional

 

[FLRNAB]

the nucleon numb is 25.. no? but none of d choices shw ds? how come is it A guys ?

Isotopes have same no of protons but different number of neutrons.

 

[FLRNAB]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
Q3. Why isn't the resultant force C? If you use vector addition the resultant would be C?

 

[peacce]

Y D?

 

[Faizan Muhammmad]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
Q3. Why isn't the resultant force C? If you use vector addition the resultant would be C?

motion in circle.....
force always towards centre

 

[Faizan Muhammmad]

Y D?

A, B cant since angle of incidence not equal to angle of reflectioN
C cant since refracted has to bend away from normal

 

[Ahsan Zafar]

total internal reflection. secondly light will move away from normal since it is a lesser dense medium i.e air

 

[Faizan Muhammmad]

total internal reflection. secondly light will move away from normal since it is a lesser dense medium i.e air

if you quote the addressee people will not think you are a madman talking to yourself

 

[FLRNAB]

motion in circle.....
force always towards centre

I know that. It's the centripetal force acting on the object but the object is turning because there is a resultant force. Two forces are acting on the car one is the forward force by the engine and the centripetal force due to friction. If you try to use vector addition to find the resultant it should be in between the two forces right? If so then resultant should be in the direction of C.

 

[Faizan Muhammmad]

I know that. It's the centripetal force acting on the object but the object is turning because there is a resultant force. Two forces are acting on the car one is the forward force by the engine and the centripetal force due to friction. If you try to use vector addition to find the resultant it should be in between the two forces right? If so then resultant should be in the direction of C.

nope
the resultant force in circular motion is towards centre

 

[peacce]

yeh kia bolre hein???????????

 

[funky brat]

I know that. It's the centripetal force acting on the object but the object is turning because there is a resultant force. Two forces are acting on the car one is the forward force by the engine and the centripetal force due to friction. If you try to use vector addition to find the resultant it should be in between the two forces right? If so then resultant should be in the direction of C.

It's a circle, in circle the resultant force acts excatly in the centre around which the thing is moving.

 

[funky brat]

View attachment 42974 yeh kia bolre hein???????????

Lol.
Yar dekho, R ki resistance increase kare gey uskey across potential diff. bhi increase kary ga. To capactior ko charge homay main ziada time lagy ga kiun kay usko p.d kam miley ga. Islye lights less frequently light up hon gey.

 

[funky brat]

nope
the resultant force in circular motion is towards centre

Paper 1's ho gae sarey?

 

[FLRNAB]

It's a circle, in circle the resultant force acts excatly in the centre around which the thing is moving.

nope
the resultant force in circular motion is towards centre

Show me some proof.

 

[funky brat]

Show me some proof.

That thread thingy, when you are moving it in a circle there is a resultant force in the centre of the circle that keeps on pulling it towards it. And when you leave it the thread goes straight with a tangent to the circle, if the force was not towards the centre the thread would not move like this.

 

[FLRNAB]

That thread thingy, when you are moving it in a circle there is a resultant force in the centre of the circle that keeps on pulling it towards it. And when you leave it the thread goes straight with a tangent to the circle, if the force was not towards the centre the thread would not move like this.

But that force in the thread is the centripetal force and not the resultant force. The stone is moving in a circle to the resultant direction should be circular.

 

[peacce]

Lol.
Yar dekho, R ki resistance increase kare gey uskey across potential diff. bhi increase kary ga. To capactior ko charge homay main ziada time lagy ga kiun kay usko p.d kam miley ga. Islye lights less frequently light up hon gey.

nhi aya samjh