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Physics: Post your doubts here!

hmlahori

hmlahori

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unique840 said:
june 06) q2: we have to remember the reasonable estimates. option D is correct cox the wavelength of visible light is in nanometres.
12) momentum before and after remains same. before collision it was:
3mv - 2mv
= mv
before = after
mv = 4mv'
where v' is the new speed
m cancels out
v' = v/4
14) turning effect = F.d costheta
for a larger turning effect, F and d should be larger and "cos theta" must be greater
cos theta increases as angle decreases.
so option B is correct
Click to expand...

can the turning effect of force also be equal to F.d sintheta in other situations or is it always F.d costheta?
 
hmlahori

hmlahori

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unique840 said:
nov 08 q27) it is a stationary wave. so there is half wave between 2 maximum. half wave is 15mm so full wave will be 30mm. v = f*lambda
3*10^8 = f * 30*10^-3
f = 1*10^10
option C
Click to expand...

Isnt the distance between the two maxima equal to one wavelenght not half?
 
U

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hmlahori said:
can the turning effect of force also be equal to F.d sintheta in other situations or is it always F.d costheta?
Click to expand...
it can be F.d sintheta. but the distance taken should always be perpendicular to the pivot. in this ques perp distance will be cos theta
 
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hmlahori said:
Isnt the distance between the two maxima equal to one wavelenght not half?
Click to expand...
for a stationary wave, it is half wavelength. cox we need antinode at one end and node at other. first time it will be quarter wavelength. next time it will be 3/4 wavelength. so difference between the two will be half wavelength
 
confused123

confused123

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Sana101 said:
PAPER 1 OCT/NOV 2010 /11:)
I need help with Q)13,18,19,24,33,34
http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w10_qp_11.pdf
Click to expand...
u r asking same questions again and again. i have already answered these. type the confusion in the respective mcq.

18th : Power = F into V , F = ma , so m1g-m2g will give you the tension in the string. multiply it with v, u will get the power. D is the right option.

19) Pressure = p g h , 1020 into 10 into 10,000m = 102000000 = 10^8 Pa D option!

i don't know 24!

don't know 33

34: done on previous pages here
 
confused123

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NokiaN95638 said:
Guyz can ne1 help me with these Q
http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s10_qp_11.pdf Q no 27, 29
Click to expand...
27) its zero because the distance moved by the unit positive charge is not in the direction of the force applied. the force here is towards the centre. centripetal force. what say?

29)direction of field is INTO the paper. u need to make 3D view in your mind. its coming out of the paper from positive to negative. when electron beam travels from left to right, it will come out of the paper into the observer eyes.
 
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NokiaN95638

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confused123 said:
27) its zero because the distance moved by the unit positive charge is not in the direction of the force applied. the force here is towards the centre. centripetal force. what say?

29)direction of field is INTO the paper. u need to make 3D view in your mind. its coming out of the paper from positive to negative. when electron beam travels from left to right, it will come out of the paper into the observer eyes.
Click to expand...

Thnks Mate.
 
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