Only the coasting model makes the assumption that the universe's expansion pace never changes.
The current expansion of the cosmos is predicted by all four hypotheses.
Only the recollapsing model foresees the eventual contraction of the universe.
The average mass density of the cosmos is predicted to be exactly the critical density only under the critical model.
The cosmos is only predicted to be expanding more quickly than it did in the distant past by the accelerating model.
Cosmologists use observations of radiation released soon after the Big Bang to determine the expansion rate, often known as the Hubble constant.
Since the unexpected finding that the universe's expansion is speeding up in 1998, cosmologists have incorporated repulsive dark energy into their theory of cosmic development. The Hubble constant's inconsistent values might be resolved by early dark energy, an additional amount of dark energy present in the early cosmos. This early dark energy would have accelerated the universe's expansion by exerting external pressure.
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Answer:
Also 0
Explanation:
Since average speed of an object is that object's displacement over a unit of time, when an average speed is 0, its displacement over a unit of time must also be 0. When an average speed is not 0, then its displacement over a unit of time is also not 0 for that interval.
Answer:
Mistakes, chaos theory.
Explanation:
Weather forecast refers to the application of technology and science in predicting what the condition's of an atmosphere would be at a particular time in a given location. Keyword here is "Predicting."
To accurately "predict" the weather, observation data needs to be collected from weather stations across the world. The data collected from the stations are too complex such that they can only be processed by supercomputers.
It is important to note that supercomputers used to predict weather are liable to make mistakes because the enormous challenge of weather forecasting is more than their capabilities.
In addition, there is a concept known as chaos theory. It explains how very small changes in initial weather conditions can change the final results. No thanks to chaos, meteorologists would not be able to predict weather accurately.
This is the reason why the world still suffers from the incidence of surprise rain, storms and other weather events that could be devastating.
Answer:
Option b. Dark spot
Explanation:
Michelson interferometer gives the path difference of the light as path difference, d as twice the distance moved or covered by the mirror 
, x and is given as:
d= 2x
Since, its an even multiple, we obtain a bright fringe
now, when the move half the distance, i.e., 
Therefore, the path difference for half the distance is:
d = x
As it is clear that its an odd multiple which correspond to dark spot as the final image
