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Concerns the application of the laws of physics to analyze common situations encountered in everyday life.

0
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This is a theory which may be wrong but could be tested. I looked on weatherspark.com (I have no idea if that is a reputable source) for the average daily temperature variation in Kolkata in June and …
answered Jan 31 '18 by tfb
45
votes
The pendulum is being driven by the magnet: the fixed magnet in the clock is actually the pole of an electromagnet which the clock is using to drive the pendulum: the clock is putting energy into the …
answered Feb 9 '18 by tfb
3
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If you heat and cool things you induce thermal stresses inside them. If the object is made of two other objects bonded to each other this can cause the bonds to fail. In the case of a rusted nut & b …
answered Sep 29 '17 by tfb
3
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Assuming the doors are shut and you are not very close to the window, then: there is no significant movement of air through the room as the doors are shut and it has nowhere to go, so you feel no w …
answered Feb 28 '16 by tfb
2
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A wing is an object which is designed to generate lift while keeping drag low. That's exactly what you want from a rudder: lift from the rudder turns the ship, while drag from it means you need to bu …
answered Apr 24 by tfb
2
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Brake fluid can get really hot because brakes get really hot and some of the fluid is very close to those hot parts. Brake fluid works as a liquid rod: when you push on one end of the brake pipe it p …
answered Jul 10 '17 by tfb
77
votes
It is probably creeping. This is often because of thermal (or humidity) cycling. Essentially, the rug and the floor are going through some thermal or humidity cycle (over the course of the day usual …
answered Nov 3 '17 by tfb
1
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I am not sure, but I suspect what you hear is sound from the ballast as the field changes in it, causing it to physically change size slightly. You get similar thumps from large transformers as they …
answered Dec 19 '16 by tfb
5
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What you are hearing is mains hum: mains electricity is alternating current (ie the voltage is approximately sinusoidal and symmetric about zero), with a frequency of 50Hz or 60Hz. things like kettle …
answered May 3 '16 by tfb
3
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Not normal glasses, no. All a normal pair of glasses do is to let the eye's lens do what it wants to do anyway: form a focussed image on your retina. So glasses will only cause damage in the case wh …
answered Feb 4 '17 by tfb
1
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The sound you hear is somewhat, but not completely, analogous to someone blowing over the top of the bottle. The air-filled part of the bottle is a resonant cavity, as described in the answer to this …
answered Jun 11 '18 by tfb
1
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The cable tension varies because there are a lot of varying loads on the bridge: wind & the load from what it's designed to carry, for instance. These loads are a big deal because bridges are made to …
answered Aug 12 '18 by tfb
3
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In addition to the other answers, I think it's important to understand that you can't just make an arbitrarily strong pillar. Or rather, you can't make the ground the pillar stands on arbitrarily str …
answered Nov 21 '16 by tfb
4
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The brief answer to this is 'because the centre of mass of a bicycle is high up', and especially it is high up compared to a car, where often the front wheels can slip. To see how this works, conside …
answered Nov 15 '18 by tfb
1
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I apologise for the heuristic nature of this answer. What you are feeling is essentially a periodic variation in friction as your hand moves. You will feel the same thing if you move your hand close …
answered May 24 '17 by tfb

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