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location Australia
age 72
visits member for 3 years, 2 months
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14h
answered Is the light from the stars within our galaxy redshifted?
May
9
answered Why does it hurt more to fall from 10 stories, than 1?
May
6
comment Are there any natural phenomena on Earth that involve supersonic speeds?
The crack of a whip is the sonic boom from the tip moving faster than sound. But I suppose it does not qualify as it is man-made.
Apr
28
comment Where did energy come from?
Current measurements of the total energy content of the universe imply that it is zero. The gravitational (potential) energy is a negative factor, which seems to perfectly balance the positive energy of the mass and energy in the universe. Hence no net energy needed to be created in the big bang.
Apr
27
answered How does a liquefied gas work as a coolant?
Mar
20
awarded  Yearling
Mar
15
revised Why may an air passenger experience an electric shock when he touches the door knob of the toilet of an aeroplane flying at a high altitude?
edited body
Mar
15
answered Why may an air passenger experience an electric shock when he touches the door knob of the toilet of an aeroplane flying at a high altitude?
Mar
8
comment Travelling at the speed of light
Interesting question, except for a simple fact: you can't go at the speed of light, let alone even faster. Material bodies always travel slower than light - in this universe, anyway.
Mar
2
answered Why does deflating baloon spurting through the air make circular motion?
Feb
17
comment How to heat water at very high temepratures?
Sure it's possible to build a vessel that will take that pressure. I've read somewhere that a car engine with 11:1 compression has about 12 MPa at peak compression. So you need something strong enough to hold at least twice that pressure. Just don't ask me how! And, a petrol engine is used to get work done from the compression, so yes it could be done
Feb
15
comment How to heat water at very high temepratures?
Point taken. I did say the result is approximate. Also, being on the high side gives an added safety factor.
Feb
15
answered How to heat water at very high temepratures?
Feb
10
comment How much potential fusion energy is in Earth's ocean?
And of course, given the right fusion reactor (e.g. a star), even normal hydrogen can be fused, producing about 3000 times more energy. And the oxygen can also be fused (use any available supernova...)
Jan
27
answered If you are on Earth, are your mass and weight the same?
Jan
4
comment Could I materialize electricity making my own lighting?
Shuffle your feet on a synthetic carpet or a while, then touch a tap or doorknob. The resulting spark is lightning (in miniature).
Jan
3
comment Does turning a light off save electricity in a room heated by an electric space heater?
I'd like to see a light bulb with 75% efficiency! Most incandescents convert only about 2% of the energy into light. So, regardless what happens to the light, it's the 98% wastage that heats the room. LEDs are around 6x more efficient, i.e. they still waste almost 90% as heat.
Dec
17
awarded  Nice Answer
Dec
7
answered Frequency of a photon
Dec
1
comment Is the big bang a fact?
"is the big bang actually proven?". Science is different from mathematics: nothing in science is ever "proven". All we can do is to see how well it stacks up against observations - which the big bang does very well, so far.