meta user
network profile
| bio | website | |
|---|---|---|
| location | Vancouver, Canada | |
| age | 43 | |
| visits | member for | 2 years, 3 months |
| seen | 17 hours ago | |
| stats | profile views | 871 |
Mostly C++ programmer in Vancouver.
Specialising in image processing, 3d modeling, Lidar - I'm really a physicist
|
Jun 14 |
comment |
Can a diver swim a short distance in great depths without being physically crushed by the pressure? @Gaius - yes phrased that badly, those two sentences weren't linked |
|
Jun 12 |
comment |
Is it possible to take a picture of a star? We took pictures of Betelgeuse using a 4m telescope in the early 90s with about 4-6 pixels across the star |
|
Jun 12 |
comment |
air molicules repell See physics.stackexchange.com/questions/23797/… |
|
Jun 6 |
comment |
What size will the sun become once it is a red giant? @Thriveth - that's only an issue for you feeble humans |
|
May 27 |
comment |
Do quantum computers manufactured by D-Wave Systems, Inc. work? @wsc =- assuming the senator in question knew that DWave was Canadian ;-) |
|
May 27 |
comment |
Do quantum computers manufactured by D-Wave Systems, Inc. work? @wsc if they think that buying a useless machine now means the company will be around to produce a workable machine later might make sense. But in more general term - don't assume that Nasa investing in tech X means that it's rocket-scientist approved ! |
|
May 27 |
comment |
Does more reflective aluminum foil make a room cooler compared to less reflective foil? @user462608 take a sheet of bubble wrap used in packaging, fix this on the window between the aluminium foil and the glass. The aluminium heats up from the 20% of the sun it doesn't reflect, the air in the bubble wrap stops this conducting to the glass |
|
May 27 |
comment |
What is the minimum wrap around angles of belt, timing belt and chain? Probably a reasonable value assumed by the engineer building the car and so the person writing the book. But the engineer would be free to use a super-sticky belt and a 10deg wrap angle or a super low friction belt which has to be wrapped 4 times around the pulley. But since the belts are all pretty much the same material on the same material pulleys and subject to similar loads they will have typical values. But these might not apply to an F1 car engine or a 30,000Hp marine diesel |
|
May 26 |
comment |
Huge buildings affect Earth's rotation? @BrandonEnright compared to the mass of rain in a tropical storm it is tiny so it would be lost in the random noise of earth's rotation changes |
|
May 21 |
comment |
The nature of resistance at copper wire terminations @007 feel free to edit answers to improve them |
|
May 20 |
comment |
Electric power transmission No Ohm's law refers to the voltage difference accros the resistor - in this case the transmission line |
|
May 19 |
comment |
Can a diver swim a short distance in great depths without being physically crushed by the pressure? Remember at pressure that lungful of air had more oxygen. One of the hard things to teach scuba diving students is that they can (and must) keep exhaling on the way up - and that essentially more air is "appearing" in their lungs as they rise. |
|
May 18 |
comment |
Can a diver swim a short distance in great depths without being physically crushed by the pressure? Submariners would also need to pressurise to the external pressure, however briefly, simply to get the hatch open! I suspect that the time is short enough you don't dissolve significant nitrogen. |
|
May 17 |
comment |
Why doesn't light kill me? @FrankPresenciaFandos - to a limited extent. If we had an atmosphere that allowed lots of extreme-UV or hard X-ray it's unlikely life could have evolved at all. |
|
May 17 |
comment |
Why doesn't light kill me? @MichaelBrown - yes if you are made of KDP you should be careful of sunbathing even on a cloudy day. |
|
May 12 |
comment |
Computer cooling with dry ice, ideas and question; thermodynamics It's also very difficult ,mechanically, to cool something with a solid that sublimes. Firstly it's hard to get a good thermal contact between the solid cryogen and a heat exchanger and then the boiling gas creates a thermal barrier. Solid LN2 used to be used to cool instruments below 77k before mechanical coolers and it was a royal pain |
|
May 2 |
comment |
Enginering question about F1 car @user2018790 - it varies as they change the rules - but at one point F1 cars generated about 2x their weight in downforce! |
|
Apr 28 |
comment |
Smallest force to move a brick @chersanya - it's easy to get confused about forces, especially mixtures of static and dynamic force. But if you think in terms of energy conservation you know it must be true |
|
Apr 25 |
comment |
Wind effect on driving a ground-based vehicle @MikeDunlavey - probably a major concern to many sports car drivers ;-) |
|
Apr 15 |
comment |
Does Earth produce metallic elements in its core? Beta decay could produce a metal from a non-metal - but that's just hair (or neutron) splitting |
