Why are there two tides a day, when the Earth rotates just
once in 24 hours?
I have been given two answers to this.
Like the water, the Earth is pulled towards the moon. The
water on the far side of the Earth (away from the moon) is pulled
less, because it is further away.
The moon does not actually rotate around the Earth: they are
too similar in size. Instead, they both rotate around a common
axis. The water on the near side of the Earth is attracted by
the moon's gravity; the water on the far side of the Earth is
thrown out by the centrifugal force (okay, we know there is no
such thing as centrifugal force, but let's call it that for the
sake of simplicity).
Any comments on either of these? The first sounds rather weak
to me.
How long is a quantum leap?
How long, in seconds, is a quantum leap?
No replies as yet, beyond saying that my picture is far too
simplistic. But it is the picture given to me in the text books,
so how should it be improved?
How does gravity work?
We are told that gravity works because mass distorts the
fabric of space-time, but this is nonsense: a distortion alone
will not make an object move.
No replies as yet.
Questions about multiple universes
Energy conservation
Does a quantum event double the energy in the universe?
No replies as yet.
Interference
Does a quantum event tie two universes together?
No replies as yet.
Infinite speed
Does a quantum event require infinite speed?
No replies as yet.
Can antimatter annihilation fail to conserve spin?
Can a particle-antiparticle annihilation result in a failure
to conserve spin?
The only way I see round this is to assume that particles and
their antiparticles do not annihilate each other in general, but
only if they share every measurable quantity in common. But this
is not a limitation the text books mention.