Physics: Post your doubts here!

[Mohammed salik]

Hello,
I didn't understand how you solved this part of the question. How did you get N/No = 1/10?
I'll be really grateful if you could explain the whole solution in detail.
Jazakallah

Which year and Question? I may Help !

 

[salvatore]

Which year and Question? I may Help !

Thank you for your kind reply
Its m/j 2005 qn no. 7(c). Here's the question paper:
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s05_qp_4.pdf

 

[Mohammed salik]

Thank you for your kind reply
Its m/j 2005 qn no. 7(c). Here's the question paper:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_4.pdf

Ohh I m Sorry!! I'm in As!!

 

[Thought blocker]

*cough*

 

[mahabaloch]

now i am tired please remind me to solve rest of them in evening.

Thank You can you help with the rest

 

[Mohammed salik]

Thank You can you help with the rest

Could You please Post questions again..! I May help (if its As)!!

 

[mehria]

MemoryMatrix 21

 

[MemoryMatrix 21]

MemoryMatrix 21

JazakAllah Khair !!!
i cnnt view the 1st file completely .....
May Allah Bless u immensly 4 this !!!

 

[Suchal Riaz]

Thank You can you help with the rest

did i do the winter 2008 papers?

 

[mehria]

JazakAllah Khair !!!
i cnnt view the 1st file completely .....
May Allah Bless u immensly 4 this !!!

U're welcum...
n if u need any help then feel free to ask...

 

[Mohammed salik]

MemoryMatrix 21

WOW!! Krichoff's Law Was Amazing!! Thnk uuuu (I always have problem with those)!

 

[MemoryMatrix 21]

U're welcum...
n if u need any help then feel free to ask...

thx a million ........ u always help me

 

[MissBellum]

u may b asked to find the *number* of moles ..... so we hv to ultiply with this avagadro
constant (6.02*10^23)
as, by definition : mole is the amount containing a no. of particles equal to avagadro constant

ok, so this equation is just the mean kinetic energy for one particle?

 

[Thought blocker]

mehria you are awesome.

 

[Suchal Riaz]

mahabaloch
w08
Q3(b)
the 12 and 2.5 N blocks exert clockwise moment. sack exerts clockwise moment. for them to be in equilibrium the sum of anticlockwise moment = sum of clockwise moment
12N * 84 cm + 2.5 N * 72 cm = W * 4.8 cm
4.8W=1188Ncm
W=1188/4.8=247.5N
the balance will be imprecise because the length of sliding of masses would be very small so there will be large uncertainty in the length.

 

[mehria]

mehria you are awesome.

i knw that

 

[Suchal Riaz]

mahabaloch
w08
q7(b)
the combined resistance of 5000 and thermister will decrease because at high temperature the resistance of thermistor decrease.
the p.d across the 5000 and thermistor will decrease.
by potential divider formula, the p.d across 2000 will increase.
volt meter shows the p.d across 2000 resistor.
so volt meter reading increase.
let R be resistance of 5000 resistor plus thermistor
so 2000/(2000+R) * 6=3.6 V [this is potential divider formula]
solve for R, R=1333 ohm
but R is combined resistance of thermistor and 500 resistor
so 1/R = 1/5000 + 1/Rt
Rt = 1820 ohm

 

[Suchal Riaz]

mahabaloch
s10_22
Q4(c)
at lowest frequency the wavelength = 4 L
speed = F λ
so F=speed/λ
F=330/4L = 330/4(0.45m)=183Hz
Q5(b)(ii)
no calculations are required but it is visible from graph that the strain after the limit of proportionality is 3.5 so the same will be final strain after unloading.

the markscheme says this mark was cancelled because the inconsistency of power of ten. i assume that they meant 2.5X10^8 not 6

 

[Thought blocker]

mahabaloch
s10_22
Q4(c)
at lowest frequency the wavelength = 4 L
speed = F λ
so F=speed/λ
F=330/4L = 330/4(0.45m)=183Hz
Q5(b)(ii)
no calculations are required but it is visible from graph that the strain after the limit of proportionality is 3.5 so the same will be final strain after unloading.
View attachment 40787
the markscheme says this mark was cancelled because the inconsistency of power of ten. i assume that they meant 2.5X10^8 not 6

Lets start waves

 

[♣♠ Magnanimous ♣♠]

Lets start waves

i wanna join as i said you in school.. dont forget.