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Dec
3
comment Does the mass of an electron change with its “energy state”?
@Geoffrey Scalar does not mean what you think it is. It means it is invariant under rotation. In the case of SR, rotation means Lorentz boost. Only the invariant mass/rest mass is invariant under Lorentz boost (hence the name).
Dec
2
comment Will a water-cooled system heat up a room less than an air-cooled system?
Cooling also changing the process. Ohmic losses will be reduced in the core when it is cooler.
Dec
2
comment Computer cooling with dry ice, ideas and question; thermodynamics
@Lenzuola This system would cause dangerous condensation in the rig. You would need to insulate all cooling equipment to the extreme to prevent the rig shorting out (that or you dehumidify the air completely).
Dec
2
comment Computer cooling with dry ice, ideas and question; thermodynamics
@Optionparty Vaporization? Are we boiling ice cubes here?
Dec
2
comment Does the mass of an electron change with its “energy state”?
@Ruslan. I think you missed my point completely. When i said to a few ppm, that is that it has been experimentally confirmed to a few ppm. My major point is that there are different quantities called mass. Some of them scalar.
Dec
2
comment Does the mass of an electron change with its “energy state”?
@Geoffery. You are very wrong. Rest mass and inertial mass is NOT equivalent, except when at rest. Simple SR. Yes, inertial mass and gravitational mass is equivalent in massive particles to a few ppm, but i am not sure about concepts like holes.
Dec
1
comment Does the mass of an electron change with its “energy state”?
Depends on which mass you are refering to..are you speaking on Gravitational Mass or Inertial Mass or Rest Mass?
Dec
1
awarded  Critic
Dec
1
comment Why does a car go down the hill backwards even though the engine keeps running?
A typical Automatic car will NOT have a clutch (unless we are referring to double clutch control automatics), but what is called a Torque Converter. In effect they limit the amount of torque that is applied to the wheels. When the car is starting the torque converter "slips". However because of the design of a torque converter, they can only transfer ~80% of the energy across them. This is the main reason that manual (or "stick" in Americanese) is more fuel efficient. The reason that the car rolls back is that the engine isn't producing enough torque, so the torque converter slips.
Nov
30
comment Does lever needs gravitation to work?
An atmosphere is not dependent on gravity and gravity does not imply an atmosphere. They are independent. For example the ISS has an atmosphere but no gravity.
Nov
26
comment Viability of Dysons bladeless fans?
If you have ever seen a Dyson on display, working, you will find that the fan does produce significantly less turbulent air flow. Wither that is worth the $200 price tag is up to you. But yes, it IS a highly inefficient fan.
Nov
26
comment Maneuvering a space shuttle using propulsion systems?
It is better to describe the rocket engine pushing against the fuel it burns. Or as they say in Interstellar "Can't get anywhere without leaving something behind".
Nov
25
comment Gravity at event horizon
There is such thing as an acceleration event horizon. en.wikipedia.org/wiki/…
Nov
20
answered How do radio waves reach receivers without being canceled out by interference?
Nov
19
comment Is it possible to create a parachute large enough to stop all velocity?
@phresnel Would you prefer I cite Schwarzschild's Metric? To show that a 4 vector at the Schwarzschild Radius would be completely rotated?
Nov
19
awarded  Editor
Nov
19
revised Is it possible to create a parachute large enough to stop all velocity?
edited body
Nov
19
comment Thermal conductivity in vacuum
"reflect all or almost all the incoming electromagnetic waves from the surrounding environment" = " made from a material that does not emit any electromagnetic waves itself inwards"
Nov
18
answered Is it possible to create a parachute large enough to stop all velocity?
Nov
18
awarded  Nice Answer