Physics: Post your doubts here!

[Muhammad TAimoor]

speed of light is 3*10^8

*Facepalm* O___O
Thanks man!

 

[Muhammad TAimoor]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_12.pdf
MCQ 31. How is the answer C? Won'y the field decrease as the distance increases?

 

[1357911]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_12.pdf
MCQ 31. How is the answer C? Won'y the field decrease as the distance increases?

The electric field strength is constant between the 2 charged metal plates.

 

[Muhammad TAimoor]

The electric field strength is constant between the 2 charged metal plates.

What about the formula E= V/D? it shows E is inversely prop to Distance b/w the plates and I've read an MCQ as well, that validates this relationship.

 

[Dashexdan]

A hose ejects the water with speed of 20m/s on the vertical wall.The cross-sectional area of the jet is 5x10^-4. If the density of the water is 1000kg/m3, find the force acting on the wall.(water comes to rest after hitting the wall)

Need help!!

what is the answer? is it 100 N or 200?

 

[1357911]

What about the formula E= V/D? it shows E is inversely prop to Distance b/w the plates and I've read an MCQ as well, that validates this relationship.

That is for when if the charge is moving from one plate to another plate.

 

[Muhammad TAimoor]

That is for when if the charge is moving from one plate to another plate.

Oh Okay! Thanks Alot!

 

[Talhakhan]

what is the answer? is it 100 N or 200?

Its 200N how?

 

[man1811]

u see that train will overtake the other train when there distances will equal.
the 1st train is travelling with constant speed hence no acceleraion
the 2nd train is acclerating from rest hence no inital speed
using the formula
s=ut+0.5at^2
for the first train
s=10t
for the train starting from rest
s=0.5*0.5t^2
placing both equations equal to each other.
10t=0.5*0.5*t^2
solve nad get 40s

THANK YOUUUUUUUUUUUUUUUUUUUU you are a lifesaver

 

[Dashexdan]

Its 200N how?

concentrate on the base units of each quantity.
u have been provided with
density-kgm^3
velocity-ms^-1
area-m^2
hence find volume of water per seconnd by multiplying velocity and area
then to find mass per second, multiply your volume with density.
now u have kgs^-1 mass per second
using the force=mv/t
force=(m/t)*v
substitute and find the answer

 

[Ahmad Shujah]

plz explain me how the answer is A

 

[Ahmad Shujah]

Answer is D .. Help!

 

[Dashexdan]

q20 plz

 

[Nabeel.Ahmad]

q20 plz

Is the answer A?

 

[Dashexdan]

Is the answer A?

its D

 

[hells Thorn]

https://www.xtremepapers.com/commun...p1-mcqs-yearly-only.17330/page-29#post-615551
need ans :S

 

[Nabeel.Ahmad]

its D

Yes, they can not be the exact doubles of each other.
This is a confusing question.

 

[hells Thorn]

S Level/Physics (9702)/9702_s12_qp_12.pdf
Q:30

 

[Abhi Mevawala]

q20 plz

write both equation
(i) 16000=13600*9.81*h1
(ii) 8000=13600*9.81*h2
now (i)-(ii)
8000=13600*9.81*(h1-h2)
h1-h2=0.06m=6cm
nw h1 will be greater thn h2
as the pressure applied is more
and their diff is 6
so it D

 

[Abhi Mevawala]

S Level/Physics (9702)/9702_s12_qp_12.pdf
Q:30

ans is B
itz giv lambda/2=33cm
so lambda 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

 

[x-gamer-x]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_12.pdf

Q 6
thank u

 

[sma786]

Hey, i have a question!
I took Math in AS and got a "D", now i am planning to drop math and carry on with my A2 with only Physics and ICT.
What field's can i take this way?
Please reply ASAP

 

[Umar Hanad]

with your looks I say , a model or an actress