Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
Deadly_king:
--- Quote from: $!$RatJumper$!$ on November 14, 2010, 07:42:37 am ---Though could you please explain Q24 in terms of E = pL/Ae ? Like for instance by doubling L wouldn't we double E because they are proportional in the equation?
I get that the modulus doesn't change, but in terms of doubling and stuff, could you please explain :)
--- End quote ---
Since same material used the Youngs modulus is constant. Hence E remains the same which also implies pL/A is the same.
However we cannot use the formula to show that Youngs Modulus is constant as we have not been given anything about the extension produced or the force acting on the wire.
This formula would have been applicable only if we were told that the extension produced and the force were constant. ;)
Hypernova:
--- Quote from: $!$RatJumper$!$ on November 14, 2010, 10:16:09 am ---W07 Q 3, 6, 16, 22, 25, 37 :) thank you
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w07
37)
a nuclear process the decay of the nucleus
the nucleon number is not conserved.
know these
in alpha decay, 2 protons and 2 neutrons leave the nucleus.
in beta decay, a neutron changes to an electron and a proton
in y decay, radiation is emitted
Hypernova:
--- Quote from: $!$RatJumper$!$ on November 14, 2010, 10:16:09 am ---W07 Q 3, 6, 16, 22, 25, 37 :) thank you
--- End quote ---
25)
nlamda=dsin@
maximum order= d / lamda
3lamda=dsin45
d / lamda = 3 / sin45
maximum order= 4.24
so 4
ans is B
Dania:
--- Quote from: $!$RatJumper$!$ on November 14, 2010, 10:19:19 am ---Momentum before = Momentum after
Momentum before: (1000 + 10) * 0 = 0 ---> There was no initial velocity thus * 0
Momentum after: (1000 * 5) + (-10 * v) = 0 ---> Cannon ball moving in opposite direction so since it is velecity we need to specify its direction
Thus v = 500 ms-1
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Thanks!
Deadly_king:
--- Quote from: TJ-56 on November 14, 2010, 10:04:12 am ---Jun 03 No 20
The child reduced p0 BY 10% and not TO 10%, isnt it supposed to be 0.9p0 rather than 0.1p0 , he reduced it BY 10%, so 90% is the new percentage, i understood this question once, but now it seems real confusing
Nov 05 No 34
Resistance = v/I
which is 1/gradient
So the greater the gradient, the lower the resistance, at B the gradient is greater than at C, so why cant B be the correct response?
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No 20. You're actually right. Am sorry to have got you more confused as I misplaced my words. :-[
The new pressure is indeed 90% but to be able to drink the liquid, its not the new pressure which is required but rather the difference in pressure which is 10%(100 - 90).
No 34
You have a point there. :-\
But i was told by my teacher that for a graph involving I and V, gradient of tangent is never used. Rather we should use gradient of chord from the origin. From the gradient of chords, we can easily note that C has a greater value than B. ;)
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