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Nov
19
comment Law of gravitation
@qftishard - you could watch the videos while standing near a very heavy object and see if they appear to be running fast
Nov
18
comment Weighing a baloon
It would show a more negative weight, ie more buoyant, ie less mass
Nov
18
comment Weighing a baloon
hint - think upside down
Nov
17
comment Electrons and photons at absolute zero?
Do photons feel the cold ?
Nov
16
comment Determine Height of Satellite Using Path Difference
The soln is to use the rate of change of difference between the receivers. I suggest starting where the sat is directly overhead and thinking what the distances look like some small fraction of a period later - draw some triangles
Nov
16
comment Determine Height of Satellite Using Path Difference
The speed is so much faster than the period you only have to consider the wave when you are overhead. 1 period later the satelite is 2.5km away
Nov
12
answered Why friction between two smooth surfaces is high?
Nov
4
comment Do Magnets ever lose their magnetism, and if so how long does it take?
Iron magnets need a keeper to complete the circuit and preserve the magnetism.
Nov
1
comment What is the smallest item for which gravity has been recorded or observed?
The comet that ESA just landed a probe on ?
Nov
1
comment How to start an artificial gravity?
Rockets mounted tangentially on the rim ?
Nov
1
comment How we are able to see stars in night, even if they are light years away from earth?
@J.Joseph - not quite. The most distant individual stars you can see with your eye are a few 1000lyr away.
Nov
1
comment How did Cook and other astronomers time the 1769 Venus transit?
@ChrisWhite - you could do either lat or long differences to triangulate. I don't know which they used more. You have a bigger potential range in Long (without going into the polar bad weather)
Nov
1
comment How did Cook and other astronomers time the 1769 Venus transit?
@ChrisWhite oops !
Nov
1
revised How did Cook and other astronomers time the 1769 Venus transit?
added 1 character in body
Nov
1
awarded  Revival
Nov
1
answered If I lick a 9V battery, why doesn't my tongue noticeably get hotter?
Nov
1
answered How did Cook and other astronomers time the 1769 Venus transit?
Oct
31
awarded  Good Answer
Oct
30
comment What's the difference between vacuum pump and vacuum cleaner?
Turbomolecular vacuum pumps are just a fan that spin very fast and work in pretty much the same way. They reach much lower pressures than displacement pumps
Oct
29
awarded  Necromancer