physics mcq help needed! urgent!

[ifraha18]

nv 2005
q 7...
x=1/2 *at1^2
h+x=1/2*at2^2

substitute x in secnd
h+(1/2*at1^2)=1/2*at2^2
h=(1/2*at2^2) _(1/2*at1^2)
2h=a(t2^2 _t1^2)
a=2h/t2^2 _t1^2

[highly_ambitious]

m/j 2009 q18..plzzz

[ifraha18]

may june 2009 q33 plz...??

[superduper2009]

Q 18 -->pressure of a liquid is defined as
P= density x g x h

in q 18... think when the right side increases by h, the left side decreases by h...
so the difference between the heights becomes 2h..
to calculate pressure... substitute 2h instead of h and you get
P = 2h x roh x g
which is D

[superduper2009]

Q 33 --->in a parallel circuit... the votage is same for all the resistors as in q 33...
the voltage is 3-1.2 = 1.8... (cells connected in opposite directions so u subtract)
we know that I=V/R
V=1.8, R=9
I= 1.8/9 = 0.2 A
the answer is B


By the way
In May/June 2009 how do u do --->
7, 13,20,24

[ruby92]

nv 2005
q 7...
x=1/2 *at1^2
h+x=1/2*at2^2

substitute x in secnd
h+(1/2*at1^2)=1/2*at2^2
h=(1/2*at2^2) _(1/2*at1^2)
2h=a(t2^2 _t1^2)
a=2h/t2^2 _t1^2

Thank You:)

[halosh92]

Q 18 -->pressure of a liquid is defined as
P= density x g x h

in q 18... think when the right side increases by h, the left side decreases by h...
so the difference between the heights becomes 2h..
to calculate pressure... substitute 2h instead of h and you get
P = 2h x roh x g
which is D

so u consider the direction of distance here...it doesnt make sense it should be difference in heights aint it?

[ifraha18]

fr 20 june 2009
       T in P=AEe/l
       Q=(A/2*Ee)/2l
       Q=AEe/4l
p/q= AEe/l divided by AEe/4l
p/q=4

fr 24 we knw dt the ditnce between an antinode and adjacent node is 1/4 lambda

[ifraha18]

Thank You:)

ur welcme..

[ruby92]

o/n 2005 28

[sweetie]

i need an xplaination for these 2 que's urgently plzzzzzzzzzzzzz!


nov05 Q24

nov07 Q35

any help is appreciated

[ifraha18]

nv 2005 28.


wavelength is halved so  frnge spacing is halved dt is 1.5nm
further sli spacing is doubled n slit spacing is inversly rlted to frnge spacing so fringe spcing is further halfed to .75nm

[ifraha18]

in nv 2007 it is the same circuit so readings stay same!!


in nv 2005 24

amplitude doubled so intensity is 2I
further frequency is halved so intensity returns to I

[superduper2009]

can you please explain the formula u used for q20 in june 2009
thanks in advance

[ifraha18]

its hookes LAW