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5

The two lenses in modern 3D glasses are designed to select the two circular polarizations. The left lens only transmits left-circularly polarized light and the right lens only transmits right-circularly polarized light (or vice versa). The problem is that there is no material which acts as a circular polarization filter on its own. The way in which they ...


5

Earbud cords form coils in your pocket. Even if you crumple the cord, it eventually finds its way into coils as you move and the cord is agitated. The coils lie in planes that are stacked. It's been found that agitated coils spontaneously braid and knot themselves. See this paper: http://www.pnas.org/content/104/42/16432.full, which found that formation ...


3

The can is acting as a compact heat pipe. When you grasp the can, the liquified gas inside the can absorbs the heat from your hand and expands, carrying the heat away in convective currents that dissipate the heat to other parts of the surface that are at a lower temperature than your hand. Since it draws heat from your hand it feels cool to the touch.


1

Most of the masks work on the principle of adsorption. This is a surface phenomenon where particles stick to the surface of another material called adsorbent. Most commonly used material is activated charcoal. When used is a smelly environment, the particles/molecules responsible for the smell are filtered first (this happens only for larger particles) and ...


1

As an illustration of Dan's answer I get myself a diffraction grating and start looking at florescent lamps. I was frankly really disappointed because you really don't get to see the lines clearly with a grating alone. What you would see is more or less like this But I moved on and told myself that I can make myself a spectroscope and I did just that! I ...


1

Take an empirical approach; go to a oil-change place. Put the car up on a rack/lift (the kind that supports the frame, not the tires - allows tire rotation during oil change). Have them adjust tire pressure while car is up in the air; have them remeasure when the car is back on the ground (tell them why - give them "scientist for a day" certificate). Because ...


1

Short answer: plasma ball emits RF "noise". The touch screen is sensitive to noise (as it tries to detect the presence of your finger by detecting very tiny currents that appear between transparent electrodes as a result of the presence of your finger (which is dielectrically different than air ). Hoping someone else will elaborate for you.


1

Light from the source is emitted in all directions - including towards every point on the road surface. When the light hits the (wet, rough) surface of the road, it is scattered in a variety of angles. Some of the light rays will be scattered at just the right angle to enter your eye. Therefore reflected light from all different parts of the road between ...


1

People it is all about traction. It seems like too simple of an answer but that is all it is. More contact with the ground provides more friction and less slippage. It is not about torque. Torque is the rotational force about the axle. There is more torque required to spin a larger wheel than a smaller wheel so it would be better to have a smaller ...



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