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12251
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location Vancouver, Canada
age 44
visits member for 3 years, 7 months
seen 10 hours ago

Mostly C++ programmer in Vancouver.
Specialising in image processing, 3d modeling, Lidar - I'm really a physicist


Aug
20
comment Can non-conductive materials can be grounded by a wire?
The comb and you are a poor enough conductor that charge would stay on it for a time even with you holding it to ground. If you left the comb in good contact with the ground it would lose charge and not attract paper.
Aug
19
comment Teflon and induction cookware
Most Tefal (the main US brand) Teflon coated pans are Aluminium which won't work on an induction hob
Jul
29
comment Why nuclear tests move under ground since 1964?
It also provides less information to the opposition. It's harder for spy sats to measure the yield and harder to collect any samples of the waste products to identify the weapon design or performance.
Jul
28
comment How accurately can I expect to measure the gravitational constant with a club of college students?
@User58220 Originally they hoped the Earth was uniform enough that any North-South line would work.
Jul
27
comment How accurately can I expect to measure the gravitational constant with a club of college students?
Probably depends on how accurately you can measure the mutual attraction between the students. Can you suspend one of them from a rope and measure g from the pendulum period?
Jul
16
comment Do we feel the full force of the earths gravity even though the earth is spinning
see physics.stackexchange.com/q/9751
Jun
30
comment Should a Faraday cage block a radio's signal?
@AndrewGrimm as long as the gaps are significantly smaller than a wavelength then they don't matter. That's why your microwave (15cm) has a mesh with 1mm holes in the door. But for high frequencies, and ultra low noise, it is difficult to make an effective screen
Jun
28
comment Differences between 3 apples and 3 kg of apples according to base units
The SI unit of amount is the mole so he could have 0.5E-23 moles of apples
Jun
20
comment Any cheap (less than 100 euro) telescope for observing Jupiter?
there is a new site that it would be perfectly on topic for area51.stackexchange.com/proposals/40709/astronomy but that doesn't appear in the close reasons - presumably because it's beta?
Jun
20
comment Any cheap (less than 100 euro) telescope for observing Jupiter?
astronomy beta isn't listed as an other-site close option
Jun
1
comment Why a slow moving neutron is required in nuclear plants?
@Harry think of the nucleas as a drop of water. A fast neutron goes straight through before it can have any effect. A slow neutron stays in the nucleas long enough for it to interact with other nucleons, pass on some energy and split the nucleas
May
19
comment Is radioactive decay spontaneous or random?
I think you are a victim of the "learn the precise phrase in the textbook and repeat it" school of education. Sorry to hear that it has spread outside the USA
May
19
comment maintaining atmosperic pressure on mars
Or you could just use a heavier gas. Hopefully somebody reads the small print of the contract to supply "a 100KPa atmosphere" to specify that it isn't just Argon.
May
9
comment If nothing can travel faster than speed of light then how the Universe is only 13.7 billion years old?
@rijulgupta because the universe was smaller then - it does perfectly answer the question
May
9
comment Behavior of water at temperatures above 100°C
@PhilPerry - added a longer explanation
Apr
26
comment Layer thickness measurement
If you knew what the coating was and so its refractive index (eg MgF2) you could estimate the thickness just from the angle you see the magenta in white light.
Apr
25
comment Does electricity flow on the surface of a wire or in the interior?
It means that even very high power cables will be made of a number of thinner wires because once they are more than 1/2" thick the center is not being used efficiently.
Apr
19
comment When pressure is exerted on parallel hydraulic pistons, do they start extending at the same time?
As drawn both the bottom and top pipes go to the same reservoir so nothing would move at all - I'm not sure you can trust the diagram
Apr
18
comment When pressure is exerted on parallel hydraulic pistons, do they start extending at the same time?
Then of the same force acts on both cylinders at the same time - then they must both move!
Apr
18
comment When pressure is exerted on parallel hydraulic pistons, do they start extending at the same time?
Is the pressure in both cylinders the same?