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location Australia
age 72
visits member for 3 years, 4 months
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Jul
28
answered Can/will antimatter ever be superior to fusion as a practical electricity source?
Jul
3
comment Why does mixing every paint colour produce gray instead of white?
@james large: So you're telling me that if I mix red, green and blue paints the resulting colour will be white??? Try it with some real paints.
Jun
29
comment Does new energy creation exist?
@Emilio: CP violation can occur during weak interactions, and this has been observed in Kaon decay. This could (but probably does not) explain the matter/anti-matter imbalance. See en.wikipedia.org/wiki/CP_violation
Jun
16
answered How can you explain objects of unequal masses falling at the same rate using GR?
Jun
9
answered What is the voltage at every pair of points along a ideal wire that is connecting the two terminals of a battery?
May
30
comment Is the light from the stars within our galaxy redshifted?
All the stars in the galaxy rotate around the centre. They are held there by the gravity of the central black hole, the other stars and gases in the galaxy, and the dark matter in and around it. It will not expand unless, in the far future, dark energy becomes strong enough to rip it apart. We're talking many billions of years here. Other factors like collisions with other galaxies may rip it apart sooner.
May
28
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...)