Mach Numbers
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The ISA temp is 15C degrees or 59F at sea level not roughly 20, just FYI. Liked the vid.
pcushen1 4 weeks ago
Spectacular video; however, the question still aches: how come no equations? The subject we’re dealing with (which is to say, Mach quantities and the nature of sound) is easy enough…
MarvelsofaLifetime 9 months ago
I've downloaded the whole course, it's marvel. English was worth learning just for the sake of understanding your lectures.
Please do oneday lecture on imaginary (or complex) numbers. They are part of schooll curriculum although do understand it's purpose and logic. The complex numbers are so artificial and yet they are tough everywhere
comecra85 1 year ago
@stainermcbain
Why not? He gives you in in meters per second, easily convertable to kilometers per hour.. so why not give in Miles per hour also?
SteBenno 1 year ago
@JimNtexas Ah thanks that's very interesting - though I don't think I've heard of that one.
Ormaaj 1 year ago
@Ormaaj - You're thinking of the 'Standard atmosphere', google it.
JimNtexas 1 year ago
I could have sworn there was some international standard which defined Mach numbers as being the speed of sound at sea level at a given temperature and atmospheric pressure (in order to make it a reliable constant), but now I can't find a reference to that. Perhaps I'm thinking of something else and not Mach numbers?
Ormaaj 1 year ago
.......and traverse one minute of a degree on the on the sea level you have covered exactly one mile. That is why the Nautical Mile is so useful to sailors and pilots. They use it because it corresponds to the angular coordinates they are using the Latitude and Longitude.
By the way 1NM is agreed to stand for 1852 meters.
hla27b 1 year ago
@xcelpast Apart from the American mile there is also the Nautical Mile, which is actually a very reasonable and sane unit of length. One Nautical Mile corresponds to one minute of angle on the Earth surface. As you know the angle is measured in degrees (of angle). If you want to measure more precisely you can also measure in degrees, minutes (1/60'th of a degree) and seconds (1/60 of a minute). Now if you take Earth's center as your origin of measurement.......
hla27b 1 year ago
@stainermcbain He is American, that is what they use to measure speed of a regular physical object. Other countries may use (metric units) kilometres per hour
xcelpast 1 year ago