Physics: Post your doubts here!

[nehaoscar]

How A?

 

[asadalam]

View attachment 54329
Why B? Why not C?

Initially it will have less speed as it falls from rest,after that it accelerates and falls quickly so distance fallen increases faster.C implies it already had speed at the start

View attachment 54331
Why D?

F is the total force applied and mgsina is the component of the force that actually works against gravity,i.e the useful force

View attachment 54332

How D?

Directed away so think of your face as positive end and paper as negative.Hence negative charge moves towards you.

View attachment 54333
How is it D?

Ammeters have a very small resistance,so most of the current will flow through the Ammeter as its separate from the resistors.Cant be B also as this combination in parallel has lowest overall resistance

 

[asadalam]

why is it C?

Its inelastic so cant have the same velocity as before(4mv).Also it rebounds so it cant have zero velocity(2mv).Hence it can have momentum change like so

2mv-(-mv)=3mv

 

[asadalam]

View attachment 54335
How A?

In these situations it helps to assign values to the quantities.Suppose each has R as 2 Ohm.So total Resistance is 3Ohm.Hence total emf will be 6 v using P=V^2/r and I will be 2A.Hence at a junction it will split equally as both have identical resistance and power dissipated will be I2R as 1^2 x 2 as 2 W

This will be the same if you assign any other values as well.

 

[princess Anu]

how to do this

 

[The Chill Master]

http://maxpapers.com/wp-content/uploads/2012/11/9702_w14_qp_41.pdf
Q5 b (i)
The Sarcastic Retard

 

[Sinzzzz]

heyy! could someone please explain the following questions:
9702/11/O/N/11 questions 24 and 26
thanks!

 

[princess Anu]

SEE 267 at
http://physics-ref.blogspot.com/2015/01/physics-9702-doubts-help-page-44.html

can u send me the link for this

 

[princess Anu]

ans is D
can somebody post its solution pleaseee

 

[Ahmed Aqdam]

View attachment 54341 ans is D
can somebody post its solution pleaseee

What year is this from?
This is related to A2.
Apply the formula F=QQ/4Pi*E*r^2

 

[princess Anu]

What year is this from?
This is related to A2.
Apply the formula F=QQ/4Pi*E*r^2

oh lol.It is from an old paper.

Can u solve the other one too please

 

[Ahmed Aqdam]

oh lol.It is from an old paper.

Can u solve the other one too please

What is its ans?
And are you sure velocity before collision isn't mentioned?

 

[princess Anu]

yeah.& It's B

What is its ans?
And are you sure velocity before collision isn't mentioned?

 

[Zirik khan]

Can't understand the question in physics p1 m/j 13 p13 Q#11

 

[asadalam]

Can't understand the question in physics p1 m/j 13 p13 Q#11

In elastic collision relative speed of approach is relative speed of separation
B: 3-(-3) = 6-0
C: 3-(-2) = 6-1
D: 5-2 = 6-3
A 2-(-5) =/= -5-(-2)

hence A is inelastic.

 

[Ahmed Aqdam]

yeah.& It's B

Resolve momentum in x and y directions.
Resolving in x will lead to two variables, initial velocity and mass of the second puck so this will be resolved in y direction.
0=0.3*0.2sin30-m*0.15sin45
Solve to get m=0.28 kg

 

[69ermalik007]

can somebody help explain these question....

 

[Turki AbdulAziz]

Q.P http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_qp_11.pdf
M.S http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_ms_11.pdf
Can someone please help with question 33?
Why cant we say R is much greater than R(A) ??

 

[Zirik khan]

Thnx

In elastic collision relative speed of approach is relative speed of separation
B: 3-(-3) = 6-0
C: 3-(-2) = 6-1
D: 5-2 = 6-3
A 2-(-5) =/= -5-(-2)

hence A is inelastic.

 

[nehaoscar]

Why B?
The height of water in both would be h/2 right?
So then lost gpe = mgh/2

So how is it mgh/4 ??