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Motion on a frictionless surface

Suppose a body is kept on frictionless surface(but gravity os there). If we give a little push to the body , will it continue in state of motion with constant velocity or not..?….if yes then why…?

Answer.
If the surfaces are totally frictionless theñ on giving a slight push it would be put to motion with uniform velocity. Newtons first kaw is the reason. Since there is no net force acts, velocity should remain constant.
The force due to grsvity acts vrtically downwards and os canceled by the normal reaction

Ideal gas laws and Physics of the atmosphere

How can you use the ideal gas law as a model to describe the physics of the atmosphere?


and

How does a environment satellite work? How correct are they?

Asked John Tran

Observer effect in quantum physics

Hello!

Please clarify the Observer effect in quantum physics  for me.

Is it true that the results of the double-slit experiment with detection of particles at one of the slits collapsing the wave-function depend on whether observer is in the room or not. If the observer is not in the room and the results of the detector are not recorded somehow the wave function is preserved despite detection of particles at the slits by non-conscious detector.

If it is the case, have experiments been conducted to identify whether the observer has to be somehow qualified to understand the contents of the experiment to result in the collapse of the wave function?

Is there a lab open to the public where this mechanism can be observed?

Thank you!
Max

Scattering, Blue Sky, reddish sun

Sun appears blue in midday because blue light with shorter wavelength scattered most. Agreed.

Sun appears red in sunrise and sunset because sunlight travels larger distance in atmosphere.
Then why cannot blue light scatter more during sunrise and sunset??

I can’t relate the reason for blue and red of sun as the concept behind them is different.
Please Explain??

Asked Rahul Verma

Answer

Please see that during daytime SKY appears blue (not sun) because when we look at sky, it is the scattered light reaching our eyes and blue light (the blue region of the spectrum) is scattered the most and at sunrise and sunset the SUN  appears reddish because the blue light is scattered and lost. The light coming directly from sun contains less amount of blue and the sun appears reddish.

Problem from electricity

A 100 m long thread carries charges uniformly distributed along its length. An

electron, 10 cm away from the centre of the thread along a line perpendicular to the
thread experiences an attractive force of 2.7 × 10−12N. Calculate the total charge on
the thread.

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