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Physics: Post your doubts here!

Abeha Malik

Abeha Malik

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The Sarcastic Retar50 post: 879120 said:
a : 4sec
b : Distance of motorist will be 238.4 Km and for police car : 278.4 Km

Are those answers correct?
Click to expand...
No the correct answers are 50s and 2000m
 
divyaa96

divyaa96

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Hey could anyone help me with this question?

A car travelling with speed 28 ms-1 leaves a motorway on an exit road. The end of the exit road is 22m higher than the motorway. If only the force of gravity is considered, what will be the speed of the car at the end of the exit road?

A. 7.3 ms-1
B. 19 ms-1
C 21 ms-1
D 24 ms-1

I'd appreciate it if someone could explain to me how to do this question! Thanks :)
 
A

akshay 999

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can someone help me wiz zis question plz.
Monochromatic light of wavelength 690 nm passes through a diffraction grating with 300 lines per mm, producing a series of maxima on a screen.What is the greatest number of maxima that can be observed?
 
C

controlled.chaos

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  1. Assalam o alaikum people!
    Im in AS level. And I have my mid year papers frm 8 dec. :3 so kindly help me in these questions.. thanks already. :')


    1. A mass of a liquid of density ρ is thoroughly mixed with an equal mass of another liquid of density
    2ρ. No change of the total volume occurs.
    What is the density of the liquid mixture?
    A 4/3ρ B 3/2ρ C 5/3ρ D 3ρ

    2.
    4 Pollen grains are suspended in a liquid and are illuminated strongly. When observed under a
    microscope they are seen to be in continuous random motion.
    What is the reason for this?
    A convection currents in the liquid
    B evaporation of the liquid
    C molecules of the liquid colliding with the pollen grains
    D pollen grains colliding with each other
 
Thought blocker

Thought blocker

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Physicist said:
Wslm.
view qu 114 at
http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-21.html
for the 1st question.
the other one will be added soon
Click to expand...
controlled.chaos said:
  1. Assalam o alaikum people!
    Im in AS level. And I have my mid year papers frm 8 dec. :3 so kindly help me in these questions.. thanks already. :')


    1. A mass of a liquid of density ρ is thoroughly mixed with an equal mass of another liquid of density
    2ρ. No change of the total volume occurs.
    What is the density of the liquid mixture?
    A 4/3ρ B 3/2ρ C 5/3ρ D 3ρ

    2.
    4 Pollen grains are suspended in a liquid and are illuminated strongly. When observed under a
    microscope they are seen to be in continuous random motion.
    What is the reason for this?
    A convection currents in the liquid
    B evaporation of the liquid
    C molecules of the liquid colliding with the pollen grains
    D pollen grains colliding with each other
Click to expand...
1)
daum_equation_1416731604424.png
2) Brownian motion, the molecules of liquid collide with the molecules of the pollen grains.
 
S

Sewz44

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Do you all know good websites for AS level physics.....
I need a good note of OSCILLATIONS AND WAVES MODULE......
So can anyone upload a good note for me please?
 
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