24 hrs r up......full time analysis phyx P12

[Gooners]

Guyz wat was the answer to the spring matress Q as to hw to change the something..dnt rembr...
But I chose B!!!

 

[generalsZH]

mrpaudel B was nt possible i think. however it cud ve been C or D as the field lines moving from high to low potential.

 

[beststriker]

Guyz wat was the answer to the spring matress Q as to hw to change the something..dnt rembr...
But I chose B!!!

i chose B too...

 

[beststriker]

what abt the evaporation question..it was B aur C...??? and wht abt the ratio of pressures..i got 2/1

 

[libyafeb]

i got B for evaporation question but the mean kinetic energy does decrease during evaporation so i got it wrong i think.

E = FL/xA by rearranging F = ExA/L and therefore by decreasing E it means that the force required to compress would decrease making it more suitable for a bed? that was for the springs question - not sure though, just how i thought about it

Resistance question: a wire has resistance R and there is another wire with twice its length, work out its resistance in terms of R? is it 2R or 4R?

 

[Gooners]

Fr evapo Q it was true false true ...dnt rembr any option
fr resistance, it was 4R...........
As lngth doubled but volume is constant. As volume - height x area
as height/lngth doubld hence fr sme volume the area is halved
hence 2l/0.5A= 4R

 

[boy2011]

For resistance one da answer was 4R dat was a past paper question

 

[boy2011]

dat for other kinematics question ans was 2vt/g i thnk da option was C...

 

[hunter94]

what was answer of that fringe separation one???????

 

[libyafeb]

ah okay thanks for clarifying. wasnt thinking properly. and fringe seperation i got the 5.4 one

 

[hunter94]

mine was 5.4 but when i took it of spacing of full scale it was coming 4.8....nt sure

 

[boy2011]

For finge separation i am cnfused weather its 5.4 or 4.8??????wat ws evaporation question i dunt remember dat.....???????

 

[Karimgenena]

For finge separation i am cnfused weather its 5.4 or 4.8??????wat ws evaporation question i dunt remember dat.....???????

B for sure , i solved before in pastpapers

 

[Gooners]

Fringe spacing was 3 mm hence answer was 5.4 x10^-7
the kinematics equation was D in think as i did that by frmula = 2v /gt
wat do u guyz reckon?

 

[boy2011]

Kinematics question answer was 2v/g C answer

 

[Hateexams93]

kinematics i got C ,NOT D

 

[boy2011]

yaaa it was C 2vt/g i thnk

 

[Karimgenena]

yaaa it was C 2vt/g i thnk

its D (2v/gt) cuz horizontal distance is vt...veritcal distance is 1/2 gt^2...so it 2vt/gt^2 , t and t cancel out resulting in 2v/gt

 

[Karimgenena]

Fringe spacing was 3 mm hence answer was 5.4 x10^-7
the kinematics equation was D in think as i did that by frmula = 2v /gt
wat do u guyz reckon?

you r right

 

[intel1993]

yaaa it was C 2vt/g i thnk

its D (2v/gt) cuz horizontal distance is vt...veritcal distance is 1/2 gt^2...so it 2vt/gt^2 , t and t cancel out resulting in 2v/gt

It was D for sure.........