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To Quote from Conceptual Physics by Paul G Hewitt:
“Zero-angular momentum twists and turns are performed by turning one part of the body against the other. While falling, the cat rearranges its limbs and tail several times to change its rotational inertia (moment of inertia) repeatedly until it lands feet downward. During this maneuver the total angular momentum remains zero. When it is over, the cat is not turning. This maneuver rotates the body through an angle, but it does not create continuing rotation. To do so would violate angular momentum conservation”
Anchu Wilson asked:
It is known that the behaviour of microscopic particles and systems cannot be predicted.Like, the exact position of an electron cannot be determined ,but that we can give only a probable region where this can be found.So can this theory be applied to support (at least theoretically)the existence of parallel universes,where the lack of determinism in Quantum Theory can be applied ? Suppose in one universe something happens,the reverse happens in a parallel universe,just like the position of electron is indeterminate?
Can the theory of existence of parallel universes be refuted or proved?
Such a question I have discussed elsewhere in the site already. The theory of parallel universes or multiple universes is one which comes into discussion when quantum mechanics and the theory of probability is discussed.
Schrödinger’s cat is a relevant thought experiment which can be considered in this discussion.
Imagine a cat inside a box. The box is provided with a mechanism which triggers a system which inject potassium cyanide to the cat. The box is also provided with a single atom of a radio active substance. The life period of a single atom of a radio active element varies from 0 to infinity. SO, the atom may or may or decay in a given time interval. If the atom decays, the radiation emitted will trigger the cyanide injection system and it will instantly kill the cat.
If the cat is inside the box and the box is kept closed for one hour, What is the state of the cat?
Is it dead or alive?
When after one hour we open the box and see, we will EITHER see a DEAD cat or a LIVE cat depending on whether the atom decayed or not.
But the probability of decaying or not decaying of the atom during the one hour are equal. Then when we are not looking at the cat, what can we say about the state of the cat?
We can say that it is the superposition of the two probabilities. But when we make an observation, only one of the probabilities become a reality.
What happens to the other probabilities?
Some say that there is a MASTER MIND which determines which of the two (or many) probabilities should become the reality. One of the many probability becomes a reality and all others collapse.
It’s right to remember one saying in this context;
“To say YES to somebody is to say NO to all others”
The another theory explaining the probability turning to reality is that, whenever we make an observation, or take a result, the universe splits into as many as the number of probabilities.
So, it’s not a Universe, but a MULTIverse.
We don’t know what actually is taking place. But it’s very thought provoking to read and think on such ideas and theories.
Here are some links which you can use for further reference.