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Can gravitational force be shielded?

tl;dr : No.The term gravitational shielding refers to a hypothetical process of shielding an object from the influence of a gravitational field. Experimental evidence to date indicates that no such effect exists.Gravitation is the curvature of space-time not a force acting in space-time.  Putting up a low mass fence or wall does ... Read more

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Can you explain the counter-electromotive force (Back EMF)?

That's a simple circuit where a motor is connected to a battery. The switch is initially open so there is no current flowing trough the motor. Of course, once we close the switch, the potential will be accross the mot... Read more

#science #engineering #technology #backemf #emf #voltage #electricity #physics


Can you explain the plumb pudding theory?

Plumb pudding theory, better known as Thomson model of an atom was the very fist model to describe electrons in an atom.In this model, an atom consists of blob of positive charged substance and the electrons uniformly distributed within it.The theory has last for only 5 years and was by disproved by Rutherford interpretation of the gold foil experiment which implied a very small... Read more

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Why do stars twinkle?

Just imagine that the water is swirling and moving in every direction. The straw would then appear and disapear. It would twinkle.
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Now replace the straw with a star and the water with an athmosphere :)

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Why do stars twinkle?

If you observe the sky at night to gaze for stars you have to look through the earth's atmosphere. Due to turbulences (e.g wind) and rapid temperature changes (due to pressure changes, boyancy etc.) in it, the refraction index of the air changes over time and space. Imagine that each small air parcel in the athmosphere is acting like a lense which is also moving, therefore the incoming light is... Read more

#science #engineering #technology #physics #stars