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Bsc Physics


20h
comment Crushing pressure (15,750 psi) at the bottom of Marinas Trench
@John, You are right but I did wonder if there might be an interesting equivalent physics question about the properties of gases at high pressure and how that effects diffusion across membranes and how it affects chemical processes involving haemoglobin?
20h
comment Laws first, matter and energy second?
I suggest your added final paragraph should probably be a comment but would be better taken up in Physics Meta or Physics Chat.
21h
comment Medieval counterweight trebuchet
@user36790: I feel it is either a history questions (are historians claims backed by evidence?) or an engineering question (how to contain and release multiple projectiles in the launch mechanism). There are physics questions you could ask about this but, as written, this Q doesn't seem to be about velocity, range, K.E etc.
21h
comment Medieval counterweight trebuchet
I'm voting to close this question as off-topic because it is about the historical use of a specific machine, not explicitly about the physics involved.
Aug
24
comment relationship between voltage and current
@Ahmed: only for voltage across a fixed-value resistor - not for other types of device. And only within certain limits of current, temperature and so on.
Aug
24
revised How to turn the light stronger than your strength in start
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Aug
24
comment How to turn the light stronger than your strength in start
@ThePhoton: Thanks for the correction. I was thinking of night-vision binoculars etc.
Aug
24
comment Are we teleporting?
Pixels are a bad example, the physical pixels are not in motion. When you participate in a Mexican wave, the motion of the wave does not mean your hands are no longer attached to your arms, your own raised hands do not travel around the stadium while you sit and watch them. If the wave passes a grumpy, nonparticaptory section of people, the wave is discontinuous but that doesn't mean the motion of your own hands are discontinuous. Can you select a better example and/or ask a concise question about a physics concept?
Aug
24
answered How to turn the light stronger than your strength in start
Aug
19
comment How can I calculate whether a shelf is strong enough to support a falling cat?
Did you forget to caption the LOLCAT (to maximize Intertube winnage)?
Aug
18
comment Why isn't spent nuclear fuel used as a heat source?
I don't have the figures but it may be you are overestimating the amount of useful heat generated. According to XKCD, swimming in a spent-fuel pond may be quite comfortable and, radiologically, safer than where you are sitting right now.
Jul
28
comment The returning light beam that is perpendicular to Earth’s motion
The animated GIFs in the Wikipedia article seem to illustrate this quite well.
Jul
24
comment Will computer fan rotate slower if one makes impeller heavier?
It would probably just take longer (and more energy) to spin- up (i.e. accelerate) to its normal speed.
Jul
20
comment What's the need of a polished surface in a plane mirror?
Which textbook, which page?
Jul
19
comment Does a propeller being pushed through the air have more friction if free to spin?
"spinning indeed reduces friction". That is counter intuitive - for example 1. a falling sycamore leaf spins (somewhat like a propellor blade) and presumably doing so creates extra drag so that it's descent is slower and any wind-bourne dispersion greater? 2., autorotation is necessary for helicopters safe descent after engine failure. 3. feathering of aircraft props on dead engines to reduce drag.
Jul
13
revised Newton's laws and the maximum speed
added 177 characters in body
Jul
13
comment Newton's laws and the maximum speed
@Michael: Ah OK, answer updated.
Jul
13
revised Newton's laws and the maximum speed
added 177 characters in body
Jul
13
revised Newton's laws and the maximum speed
added 15 characters in body
Jul
13
answered Newton's laws and the maximum speed