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Showing posts from April 3, 2022

### Simple Harmonic Motion of a liquid inside a U Tube

The above shows how a column of liquid of density ρ can be made to oscillate while undergoing SHM, simple harmonic motion. When you blow gently into the tube at one end, the excess weight of the column of height, x, pushes the rest of the liquid down with a force that results in an downward acceleration. It can be shown that the acceleration of the liquid in the column in question is proportional to the negative displacement. Therefore, the motion of the liquid is simple harmonic. If you want to learn more about the simple harmonic motion - proofs and worked examples - please follow this link below: Simple Harmonic Motion Tutorial with Simulations

### Challenging questions for A Level Physics

These are some challenging questions that may potentially appear in  the forthcoming A Level  physics   examination : 1) Two masses of 10kg each, are attached to a spring balance that is        calibrated in kg .  Spring balance What is the reading of the spring balance, m,  if the system is in balance? 2) A boat of length 5m is moored close to the shore. A man walks       from the near-end to the far-end of the boat as shown below at 12m/s. The masses of the man and the boat are 50kg and 200kg  respectively.     How far has the boat moved from the shore, when the man reached the far-end of the boat? Assume there is no friction between the boat and water and water remains stationary during the motion of the boat and the man. 3) Two objects are attached to a string and they are dropped from the      top of a tower with the string remaining slack. What would be the tension of the string in the absence of drag or air resistance? 4) A balloon filled with air and a light plank

### Chromatic Aberration

Chromatic Aberration When light hits a lens, the components of the light refract through different angles, owing to their unique wavelengths.  The blue light, for instance, refracts more than the red light; the wave length of the former is smaller than that of the latter. Chromatic Aberration - credit Wikipedia     Due to chromatic aberration, the image formed by a thick lens becomes distorted. Therefore, it has to be dealt with in optical instruments such as microscopes and telescopes. In order to address the issue, manufactures, such as Olympus, of optical instruments use combined lenses instead of single lenses in them - as shown in the above animation.