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8h
comment Maximum temperature possible on earth
@CuriousOne You're forgetting carbonate rocks. I don't imply it's likely to happen, even if we try a lot harder than we're doing now, but the CO2 is there.
14h
comment Maximum temperature possible on earth
If we work at it, earth could go the way of Venus, with a surface temperature of about 465C (740K). Now that's climate change!
Apr
26
comment Why would a modern smartphone not work if the theory of general relativity hadn't been discoverd?
Ask him what he meant, and add it to your question. Of course, they would not work at all if Quantum Mechanics had not been discovered. And neither would computers, tablets, etc.
Apr
26
comment Why would a modern smartphone not work if the theory of general relativity hadn't been discoverd?
smartphones have a GPS app built in.
Apr
26
comment Why would a modern smartphone not work if the theory of general relativity hadn't been discoverd?
This question already has an answer. See physics.stackexchange.com/q/1061
Apr
22
comment Create a laser from sun light
1 MW solar input power - so that's at least a 1000 sq m collecting area (33m x 33m) - and the link does not say what the output power is.
Apr
19
comment If an object has a temperature, does it have to radiate?
Every body with a temperature above 0K radiates
Apr
17
answered If I spinned a fan in a vacuum it will keep spinning forever. Why can we not make energy out of it?
Apr
5
comment Can Doppler Shift be used to calculate speed of an observed object?
@Rob I've yet to see an RC plane circling at relativistic speeds.
Apr
5
comment Viewing a candles flame through telescope
Nothing at all, if the candle is far enough away. A fuzzy blob if its too close.
Apr
3
comment Can Doppler Shift be used to calculate speed of an observed object?
Doppler shift can only show speed towards or away from you. If the plane is flying in a circle around you, you will not get any Doppler effect.
Apr
3
revised Are there star systems orbited by stars?
Added one of my comments
Apr
2
comment Are there star systems orbited by stars?
I'm not aware of something like that existing, but it is possible if the orbiting stars are small enough. If they're average size, then there is no "centre", just as there is no centre in the Pluto/Charon system.
Apr
2
comment Are there star systems orbited by stars?
There cannot be "multiple stars in the centre" - they orbit their centre of mass. Are you talking about a kind of "planetary system", with one heavy star in the middle and others orbiting it? I don't think such a system exists, but it is possible. The orbiting stars would have to be very small (brown dwarfs?), otherwise they won't be orbiting around anything like the centre. Most stars are 0.1 to 10 solar masses, so the centre of mass is likely to be well away from the centre.
Apr
2
answered Are there star systems orbited by stars?
Mar
29
comment If we live on the surface of Earth then why Earth images shows maps around it?
If I look at a football, why do I not see both sides of it?
Mar
27
comment How can “…electrons flow in metals, but not in the ground…” explain grounding rods?
Unfortunately, clouds can be positively or negatively charged. If the cloud is negative relative to the earth, the electrons will flow into the ground (electrons are negative). If the cloud is positive then electrons will flow from the ground to the cloud. Either way, the electron flow tries to balance the charge difference between cloud and ground.
Mar
26
answered Why can't space become fuel for spaceships?
Mar
25
answered Which power equation to use: $P = I^2 * R$ or $P = V^2 / R$?
Mar
24
answered About speed of sound?