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Thank you so much
your help is much appreciated
Also the paper that i was referencing in the first part was actually NOV 2013 P13
As long as you understand the concepts involved, I appreciate it too
So are those first few doubts from November 2013 P13?
No its A
I tried to.... But i could not get the correct answer... I will try it again
Q8 right?
Its easy but bored to right the calculations! I had solved it millions of time, if you can type solution go on
Wait lemme see your questions
w12_12
29)
View attachment 44719
As you can see from the figure, there will be total difference b/w nodes = 3λ / 2 = L
Now we know the velocity, we can calculate λ so f = v / λ
λ = 0.2 m
f = 1650 Hz
34)
Let's go choice by choice shall we...:
B: It's said both are made from same material. So resistivity is same.
Reject B
A:
R = (resistivity * L)/A
Both are same material so we ignore resistivity for now.
So we have: R = L/A
We have to compare their cross-section areas.
A = L/R
For X:
When R = 20, L = 0.6
A = .6/20 = 0.03A
For Y:
When R = 10,
L = 0.6,
A = 0.6/10 = 0.06A
Compare 'em.
2X = Y
Is this what dear (NOT!) A is suggesting?
No. It says the opposite in fact.
So A's a no-no.
C.
Take both lengths equal. I took them 0.6m
For X, R = 20
For Y, R = 10
P = VI
SInce they're in series, I will be same for both.
For X,
P = 20I
For Y,
P = 10I
Compare 'em away.
Power of Y *2 = Power of X
WHich is exactly what C says.
So C's our choice.
But to be clear, let
s have a look at D
In parallel, current in one of the two branches, in equal to ratio of R/total of OTHER branch.
For X, (R=20) and R = 10 for Y. Total = 30
For current in X, therefore, it's 10/30 ie 1/3 I
For Y,
20/30 I
or 2/3 I
This is clearly NOT what's in D.
So D goes down.
36)
Here first we'll find the power at two points of current provided, and as its not a fixed current we would take the mean of power we get.
So it follows as :¬
Power at 2 ampere = 4 * 100 = 400W
Power at -1 ampere = -1 * 100 = -100W
Now as I said take mean of these powers : 500 / 2 = 250W
37)
Its not D as no current will pass if both switch are open. Then its not even A as both are closed so current will be I. In B S2 is open and S1 is closed so current just flows in series so current is still I. In C current flows through parallel circuit as S1 is open and S2 closed and current is not equal in parallel so it will not be I
38)
remember when two resistor are in series, more voltage drop is at resistor with more value, so their a flashing light then R = 5 mega ohm when dark, then 5M is very large than 1 K of other resistor, then almost all voltage drop at 5M, hope you get this, it is a very simple concept.
39)
Whats the big deal here ?
You know that nucleon number in helium is 4 (helium = alpha particle)
Then from original substance 100 alpha get removed every second, so in alpha, 4 * 100 = 400 nucleon each second.
s12_12
7)
Its A, because according to velocity time graph, we can see that its negative after half the time. That means that guy has changed his direction. this describes The scenario that a man run stratis gradually increasing hi speed and then after certain reducing speed and an he changes is direction(moves backward) with same speed pattern.
Now considering this troy with displacement, that guy reaches the farthest point and then comes back i.e max displacement after halftime.
10)
Keep this thing in mind when you are asked for projectile thingy :
Now look it practically,
- horizontal component of velocity = constant
- vertical component of acceleration constant = constant
- At top most, vertical velocity is zero
you throw a ball, when it reaches max height (top) it stops for a while
KE cannot be zero
KE = 0.5mv^2
v = root(square(vx) + square(vy))
vy = 0
but vx = constant
so v is nonzeror and hence KE canot be zero
similarly momentum canot be zero
P=mv
17)
Base has h = 0, i.e is block 1 = zero * mgh
Now we have other 3 blocks.
block 2 = at height h so m*g*h = mgh
block 3 = at height 2h = 2mgh
block 4 = height 3h = 3mgh
Sum all this P.E = 6mgh
28)
View attachment 44722
30)
Given
λ/2=33cm
so λ is 66cm or 0.66m
f=330/0.66=500
T=1/500=2ms
so it means wave should be completed in 4 blockss as the time base is 0.50ms/cm
the only one is B
i am getting C, not A.Its easy but bored to right the calculations! I had solved it millions of time, if you can type solution go on
Well weren't they easy
(jk)
Whats though ?
Use the equation of motion s = ut + 0.5at^2
thanks broo for the help again! but 1 small problem, wenever i open the attachment for s12 question 28 i get an error, is the link down or is just me?Wait lemme see your questions
I solved that paper for you :
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