Questions tagged [physics]

Use this tag for questions about the physical nature of reality and in particular claims that are strictly about the field of physics. Please use specific tags if the question is about other sciences such as chemistry. Also consider to add [electromagnetism] and [radiation] if appropriate.

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3
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1answer
264 views

Can electricity be obtained from neutrino radiation, like a solar cell?

Power Technology magazine published a 2019 article *Neutrino energy: harnessing the power of cosmic radiation. It describes a new energy technology - making solar panels, but for neutrinos instead of ...
11
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1answer
725 views

Does aluminum foil safeguard your credit card from RFID attacks?

Evidence against Does Aluminum Foil Stop Identity Theft? Some sources say that if you actually have an RFID-enabled credit card, aluminum foil does the same job, if not better, than an expensive ...
3
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1answer
514 views

Is the water used in coal burning power plants “never returned to the environment”?

According to a Duke University press release titled Replacing Coal with Gas or Renewables Saves Billions of Gallons of Water: Water consumption – the amount of water used by a power plant and ...
44
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2answers
7k views

Does wetting a beer glass change the foam characteristics?

Many bars rinse a beer glass immediately before serving. I've consulted with bartenders and Google, and there's some confusion about it. Some sites claim it reduces foaming. Another perk is that ...
57
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2answers
12k views

Did the British navy fail to take into account the ballistics correction due to Coriolis force during WW1 Falkland Islands battle?

In Natural History magazine article, Neil DeGrasse Tyson claims the following: The military normally knows all about the Coriolis force and thus introduces the appropriate correction to all missile ...
17
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0answers
425 views

In a lightning storm, is it safer to stand near a beech than near an oak?

According to a German folk wisdom, in a lightning storm one should avoid oaks and seek out beeches. German Wikipedia on Volksweisheit: „Buchen sollst Du suchen, Eichen sollst Du weichen“ Meaning ...
25
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1answer
1k views

Is Feynman's claim about the history of measurements of the charge of the electron after Millikan accurate?

In a 1974 speech Richard Feynman famously described an example of confirmation bias in science: One example: Millikan measured the charge on an electron by an experiment with falling oil drops, and ...
-7
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1answer
385 views

Is the Infinity MG10 a working generator that consumes no fuel?

Infinity Sav are a company pushing a product, the MG10 which is available for pre-order which, they claim, can generate electricity without consuming fuel - i.e. is a free energy machine. The ...
71
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4answers
15k views

Do wooden building fires get hotter than 600°C?

After the recent Notre-Dame de Paris fire, there has been a heavily re-posted tweet going around in response to an earlier claim that a golden cross did not melt or deform - due to an act of God. ...
5
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1answer
1k views

Can light travel at 30x the speed of light? [closed]

The claim seems to be that the researchers can make light travel faster than the speed of light. Is this true? How does it even make sense? It’s in Nature so presumably there’s something in it, but ...
58
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2answers
15k views

Has the laser at Magurele, Romania reached a tenth of the Sun's power?

This month the laser at Magurele, Romania became the most powerful laser in the world, according to various sources. Related: Is the laser built in Măgurele, România, the most powerful in the ...
32
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0answers
802 views

Does cutting paper dull a knife quickly? [duplicate]

This question is a follow-up to "How to test the sharpness of a knife?", my answer to it, and the comments my answer generated. Charlie Brumbaugh wanted to know how to tell when he is done when ...
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0answers
411 views

Are two layers better at insulating body heat than one double-thickness layer? [closed]

It is almost universally recommended that wearing multiple layers of clothing is the most effective way to stay warm in cold weather, compared to one thicker layer, although there seems to be little ...
3
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1answer
859 views

Does Heads Up Texas Hold'em have more possible hands than atoms in the universe?

In the Vice (HBO) clip AI Poker Bots Are Beating The World's Best Players, it is claimed (at 2:00), that Texas Hold'em has "more possible hands than atoms in the universe". ..this competition ...
2
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0answers
501 views

Can ridges on the bottom of shakers be used to help with dispensing?

From https://twitter.com/LipBitinANNAmal/status/1078840770864529408 156,700 Retweets 376,681 Likes (probably not the original author): How old were y’all when you found out the ridges on the bottom ...
4
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1answer
552 views

Do lipid droplets in our skin create a laser?

The home page of Dr Jack Kruse, who claims to be a neurosurgeon and "optimal health educator" contains the following paragraph: There is a deep connection between thermodynamics in biology and the ...
21
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1answer
1k views

Does turning the lamp in my classroom off and on use more energy than it being turned on for 30 minutes?

My physics teacher regularly said to our class: Turning these lights [pointing to the ceiling of the classroom] off and on uses more energy than leaving them on for 30 minutes. Is this true? I ...
1
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1answer
539 views

Does General Relativity bring “Cosmic Time,” which is the same for all frames-of-reference?

In a recent podcast, the philosopher William Lane Craig said that while Special Relativity taught us to doubt whether any given clock is, or whether it could be, an absolute measure of time, General ...
16
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2answers
1k views

Is redefining the kilogram useful for drug development and nanotechnology?

With the redefinition of kilogram currently underway, I see recent online articles claiming that a precise definition of the kilogram is critical for drug development and nanotechnology. E.g. BBC.com ...
3
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1answer
300 views

Does the Wowfixit screen protector harden phone screens?

The WOWFIXIT web-page offers a product where you wipe a liquid over your phone screen and polish it. They claim the result will make your protect your phone screen from scratches: One of the many ...
65
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1answer
9k views

Antistatic bracelet without a ground connection

Last winter in Japan, some of my friends were buying bracelets like this, that claim to prevent or reduce static shocks: Here is an advertisement picture describing how it is supposed to be used, ...
-1
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3answers
2k views

Is the F-35 aircraft literally invisible? [closed]

Donald Trump said of the F-35 "You can’t see it. You literally can’t see it. It’s hard to fight a plane you can’t see" The video of him saying this makes it seem as if he really believes it can't be ...
4
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0answers
456 views

Does this video show a sonic boom through a sun dog?

This YouTube video purports to be of a rocket launch from the Kennedy Space Center in 2010. It shows a rocket reaching the speed of sound, and creating a sonic boom at the same time as the rocket ...
2
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0answers
500 views

Does carrying or consuming onions help to prevent heatstroke and/or reduce your body temperature?

Will consuming onions help to reduce your body temperature, or prevent heatstroke? Some common variations of this claim include applying onion juice to your skin, or even just carrying an onion in ...
72
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1answer
11k views

Are the claims made by Indian Ministers / personalities regarding ancient Indian inventions true?

In the past couple of years, several Indian Ministers / personalities have made claims regarding existence of modern inventions in Ancient India. Prime Minister Modi claimed that genetic science ...
14
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2answers
3k views

Has the speed of light significantly slowed down over the past 6,000 years?

One of the problems for young-Earth creationism is that we are seeing light from stars more than 6,000 light-years away, which implies that those stars pre-date the alleged date of the creation. To ...
4
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1answer
1k views

Is the laser built in Măgurele, România, the most powerful in the world?

Some news websites, including Romanian and non-Romanian ones, claim that the laser built in Măgurele, România (which is going to be used starting today), is the most powerful (and in other sources the ...
11
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4answers
3k views

Did all iron on Earth come from outer space?

According to the video 9 Shocking Facts from the Quran! Iron is not natural to the Earth. It did not form on the Earth but came down to Earth from outer space. This may sound strange but it is true....
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1answer
555 views

What evidence would remain of the use of atomic/nuclear weapons 26,000 years ago? [closed]

In his 1998 book, Yellow Sky: an alternative perspective about the human condition and history, Kenneth Lipton argues that high radon levels in southeastern Pennsylvania may provide evidence of prior ...
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1answer
463 views

Is there compelling proof against an alternative to the law of conservation of energy? [closed]

The law of conservation of energy states that energy cannot be created or destroyed, but changed into different forms, which I've never found entirely compelling. It's impossible to measure the energy ...
10
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2answers
752 views

Did thirteenth century scholars attempt to determine the congealing of oil by reading Aristotle?

In "The Production of Knowledge" William Starbuck presents the following anecdote (without providing its source). Is this anecdote based on a real historically traceable incidence? During the ...
4
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1answer
606 views

Does each doubling of CO2 cause a 2-4°C increase?

Professor Henrik Svensmark argues that cosmic rays have a strong influence on cloud formation and hence climate change. In 2016 he predicted global warming was over. He was recently the lead author of ...
15
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1answer
830 views

Can gamma rays on an airplane damage a digital camera?

Rob Hummer gave a talk at Cine Gear Expo 2011 about how film and digital cameras catch light. He makes a handful of extraordinary claims about digital sensors - including a claim that you get dead ...
20
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1answer
19k views

“The Flat Earth Society has members all around the globe”?

When one googles "The Flat Earth Society has members all around the globe", many images appear. Some of them claim this is a post by the Flat Earth Society itself, such as this one: I wonder if this ...
54
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3answers
13k views

Does plutonium exist in the world, apart from being manufactured?

In reference to the Manhattan Project at Los Alamos, a mathematician, Peter Lax, described his time working there as "living science fiction". He said: we were told essentially the basic thing: ...
3
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1answer
1k views

Does grabbing a fidget spinner in zero G cause your body to tumble rapidly?

Techly have posted a video they attribute to NASA. It shows ISS astronauts looking at a fidget spinner floating in space and grabbing it. After a jump-cut, they are shown tumbling (rotating along all ...
3
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1answer
637 views

Electro-osmotic pump to keep bunker dry

Supposedly the latest tech in keeping water out of (historically significant) bunkers is electro-osmotic pulse technology. EOP is based on the principle of electro-osmosis—the movement of a liquid ...
3
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0answers
211 views

Is there any scientific basis to this “catalytic converter” to treat hard water?

I came across this product called Softer Water Conditioners. It includes a lot of scientific sounding mumbo-jumbo to explain how it works, which raises my skepticism. Is there any scientific basis to ...
8
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1answer
680 views

Did an apple falling on Newton's head help him build his theory of gravity?

The popular belief goes like this: Isaac Newton was sitting in his garden under a tree when an apple falls on his head, and suddenly he came up with his theory of gravity. Did this event really ...
2
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0answers
484 views

Speed of light not constant as measured by many scientific / research groups, but averaged & politically standardized? [closed]

In banned/ removed TEDxTalk, The Science Delusion - Rupert Sheldrake at TEDx Whitechapel, the speaker has talked about various things but I am focused on the "constants" such as "light" that he has ...
28
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1answer
7k views

Did a lightning strike make a river roll and boil?

There's a video that I just came across on Facebook: original source: http://www.youtube.com/watch?v=TD2hyCUePL0 alternative copy: https://www.facebook.com/hardbond/videos/10155610316509339/ In the ...
12
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1answer
979 views

Did Israel install cameras that can see through clothing on the Temple Mount?

In this article Salah Abu Agrafa, a worshipper at the Temple Mount claims: “They took away the metal detectors, but they replaced them with X-ray cameras that can look at our women naked.” ...
3
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0answers
420 views

Does one kg of rock contain more energy in the form of U-238 than one kg of petroleum? [closed]

Let's consider rock and petroleum. Which contains more energy per kilogram? Due to Einstein, we know mass is energy, and the energy contents of both are equivalent. However, let's forget this and ...
2
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1answer
924 views

Does charging a phone use the same power as a washing machine? [closed]

I heard that charging a phone is the same as running a washing machine in terms of electricity but from what I understand a typical phone charger uses ~5W whereas a washing machine is near ~500W. ...
6
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1answer
581 views

Do cellphones pose any harm to pacemaker users?

In Japan it is very common to see signs on trains that encourage/require you to turn off your phone on trains, or just near the priority seating areas. The thinking goes that the signals somehow ...
0
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0answers
260 views

Would a full scale Thermonuclear War create centuries of Nuclear Winter? [duplicate]

I see the nuclear winter lots of times in Sci-Fi materials. The Matrix is a famous example. Lots of people believe in this nuclear winter thing. In real world, would a full scale Thermonuclear War ...
11
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1answer
17k views

Does cold water boil faster than hot water?

I was having a chat about science with a manager in my office. We were talking about water and he said "you shouldn't boil water from the hot tap because cold water boils faster". I know about the ...
73
votes
2answers
13k views

Do snowballs snowball?

"Snowball" as a verb, means to increase rapidly in size - a reference to the Snowball Effect: The common analogy is with the rolling of a snowball down a snow-covered hillside. As it rolls the ball ...
0
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2answers
505 views

Would it have been possible for the ancients to have built a Tower of Babel? [closed]

As recorded in Genesis 11:1-9, the ancients allegedly built a tower to the skies in a valley in Babylon (near present-day Baghdad), and God scattered them across the Earth as a punishment. As ...
6
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1answer
907 views

Did DNA, in a quartz container, absorb every photon in the room?

Lance Schuttler wrote an article arguing that DNA is a wave form that uses gravity to bend light. I'm extremely skeptical of basically every claim in the article. One of the more extreme claims ...