physics mcq help needed! urgent!

[halosh92]

Answer is B
at X it has to be tension because its opposite directions, and at Y it also has to be tension because if you look at the far end of the pillar horizantally, at the curved part on the right, if you trace the force exerted by F, you see that it applies a pulling force on Y therefore its tension, i would also assume Z is tension, BUT here's paper 1 tricks, you dont have Z with tension and your sure X and Y are tension there fore it has to be B

am rili sorry i just dont get it what u mean by:
at X it has to be tension because its opposite directions
sorry for the trouble 

[[Spy]]

am rili sorry i just dont get it what u mean by:
at X it has to be tension because its opposite directions
sorry for the trouble 

since the force W is pushing downwards, therefore X has to be going upwards just pulley for instance if you visualize it, understand?

and no its okay dont worry, what am i here for

[halosh92]

since the force W is pushing downwards, therefore X has to be going upwards just pulley for instance if you visualize it, understand?

and no its okay dont worry, what am i here for

thankyou
ok same paper  Q23

[[Spy]]

thankyou
ok same paper  Q23

at Q, displacement can not be always zero as it is not a stationary wave, therefore we eliminate B, at R, its max. displacement and therefore it stopped so that it will then go back upwards, and hence we eliminate C now

as For point P, just like R its coming to rest, and therefore it should have MINIMUM speed and not MAXIMUM speed, .  and therefore we eliminate A and the answer is D

the explanation for the answer, point S is going to start going downwards now and its going to have maximum acceleration initially then slow down as it arrives at the negative amplitude

hope this is clear

[halosh92]

at Q, displacement can not be always zero as it is not a stationary wave, therefore we eliminate B, at R, its max. displacement and therefore it stopped so that it will then go back upwards, and hence we eliminate C now

as For point P, just like R its coming to rest, and therefore it should have MINIMUM speed and not MAXIMUM speed, .  and therefore we eliminate A and the answer is D

the explanation for the answer, point S is going to start going downwards now and its going to have maximum acceleration initially then slow down as it arrives at the negative amplitude

hope this is clear

clear as crystal

[[Spy]]

clear as crystal

Great

[[Spy]]

I have a question myself, nov05 question 5
answer should be D but its C

your supposed to add the uncertainties which means its 0.1+(0.01*3)= 0.13
anyone help??? cause this is not the answer

[[Spy]]

hey guys i rewrote the question can someone please solve it now............

check for homogenety

answer is square root of g/h

[cashem'up]

thanks guys..

[cashem'up]

hasna tha? 

haha lolz jk........

[halosh92]

2007 may june
Q40

[[Spy]]

2007 may june
Q40

its supposed to be the ratio of charge/mass

and lithium has the least because charge for Lithium = 6 (protons + electrons)
and the mass= 7 therefore its 6/7

for the others if you the exact same thing you always get a larger value, and therefore its C

(ignore the negative in A)

[halosh92]

2006 nov
Q6
Q11

[yinyang]

Can anyone solve these two questions

june 2009
Q 14
Q 15

[halosh92]

I have a question myself, nov05 question 5
answer should be D but its C

your supposed to add the uncertainties which means its 0.1+(0.01*3)= 0.13
anyone help??? cause this is not the answer

first,
find volume
V=L*B*H
so u find the %uncertainity of all three variables and add them
ok
this will come out A** 0.2%+0.5%+1%=1.7%
so 1.7% is the percentage uncertainity in volume

then u find the %uncertainity in mass
(0.1/25)*100=0.4%
so to find density
u use the formula D=M/V
means division
so u hv 2 add %uncertainity of volume n mass
1.7%+0.4%=2.1%
then he gave u the calculated value of density
so (2.1/100)*2.5(density value given)
answer comes out to be 0.0525
so 0.05 which C