Physics: Post your doubts here!

[farhan141]

1 : 1 ratio.

Ok..

 

[The Sarcastic Retard]

Ok..

Not understood?

 

[farhan141]

Idividual sum of electric potentials. That 0.02 is the one small division on y axis. Here :~
View attachment 60485

So in V=W/Q. V is potential and W is weight or work?

 

[The Sarcastic Retard]

So in V=W/Q. V is potential and W is weight or work?

Potential difference is the work done per unit charge. So yes W is work done.

 

[The Sarcastic Retard]

Can anyone state what is newtons law of gravity?
I write like this : It states that it is the force of attraction between two masses which is directly proportional to the product of that masses and inversly proportional to the square of the sepration of that masses.
If I write this, wont I get 3 marks?

 

[Mahnoorfatima]

Can anyone state what is newtons law of gravity?
I write like this : It states that it is the force of attraction between two masses which is directly proportional to the product of that masses and inversly proportional to the square of the sepration of that masses.
If I write this, wont I get 3 marks?

You do get 3 marks but refer to point masses rather than just stating masses. Because one mark is for stating point masses in all the marking schemes

 

[farhan141]

Can anyone state what is newtons law of gravity?
I write like this : It states that it is the force of attraction between two masses which is directly proportional to the product of that masses and inversly proportional to the square of the sepration of that masses.
If I write this, wont I get 3 marks?

Newton's law of gravitation states that the force of attraction between two point masses is directly proportional to the product of their individual masses and inversely proportional to the square of their separation (or square of the distance between their centres).

 

[The Sarcastic Retard]

You do get 3 marks but refer to point masses rather than just stating masses. Because one mark is for stating point masses in all the marking schemes

Thanks.

 

[ashcull14]

c ( 2 )
...any better approach than this? i didnt get it

 

[The Sarcastic Retard]

c ( 2 )
...any better approach than this? i didnt get itView attachment 60496

which part u dnt understand? i will explain u that as i dont think there is ny other approach

 

[Mahnoorfatima]

Can someone please explain these parts??
1. State the evidence that the spheres are conductors
2.state and explain the distance x at which the rate of change of potential with distance is a;maximum b;minimum

 

[The Sarcastic Retard]

Can someone please explain these parts??
1. State the evidence that the spheres are conductors
2.state and explain the distance x at which the rate of change of potential with distance is a;maximum b;minimum
View attachment 60498

1. Electric field strength inside the sphere is zero. From graph we can see E to be zero at some point, thus we can say spheres are conductors.
2. maximum potential at 11.4 and minimum at any points on graph where E is becoming zero, let us take it as 8 for an instance. As electric field sthrenth is zero at that point. We know a fair idea about E is proportional to V as electric field strength is the -ve potential gradient.

 

[ashcull14]

which part u dnt understand? i will explain u that as i dont think there is ny other approach

c part 2

 

[The Sarcastic Retard]

c part 2

I mean what u dont get in the explanation part??
Work done = F*change in x.
Work done = Ep
Ep = F * 4 * 10^-2
This was the first way.
We know Ep = GMm/r
Now we know radius increases every year by 4cm.
So we know radius is changing so we can use the formula Ep = GMm(1/r1 - 1/r2)
r1 = orignal radius
r2 = 4 * 10^-2 + r1
This was the second way explained.

Now I asked u, what u dont get in this explanation, I will clear that..

 

[ashcull14]

I mean what u dont get in the explanation part??
Work done = F*change in x.
Work done = Ep
Ep = F * 4 * 10^-2
This was the first way.
We know Ep = GMm/r
Now we know radius increases every year by 4cm.
So we know radius is changing so we can use the formula Ep = GMm(1/r1 - 1/r2)
r1 = orignal radius
r2 = 4 * 10^-2
This was the second way explained.

Now I asked u, what u dont get in this explanation, I will clear that..

k i knw tht was dumb ..i got it ..ty

 

[The Sarcastic Retard]

k i knw tht was dumb ..i got it ..ty

Doubt is a doubt!
No problem ^_^

 

[Mahnoorfatima]

I mean what u dont get in the explanation part??
Work done = F*change in x.
Work done = Ep
Ep = F * 4 * 10^-2
This was the first way.
We know Ep = GMm/r
Now we know radius increases every year by 4cm.
So we know radius is changing so we can use the formula Ep = GMm(1/r1 - 1/r2)
r1 = orignal radius
r2 = 4 * 10^-2
This was the second way explained.

Now I asked u, what u dont get in this explanation, I will clear that..

isn't r2 supposed to be 4*10^-2 + r1? As it says 4cm is added to it every year? :/

 

[The Sarcastic Retard]

isn't r2 supposed to be 4*10^-2 + r1? As it says 4cm is added to it every year? :/

Oh yes!! A silly error! Thanks for that, I will add it to my explanation.
ashcull14 see this!! A small mistake can cost heck loads of marks!!

 

[Mahnoorfatima]

SOMEBODY PLSSSS

 

[The Sarcastic Retard]

View attachment 60501
SOMEBODY PLSSSS

what is the b part?