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:
23.38 years
Explanation:
Speed of Allison = 0.83 c = v
Time passed according to Allison = Δt = 29.5 years
Time dilation
For Nora 52.88 years would have passed
So, their age difference would be 52.88-29.5 = 23.38 years
Answer:
(b) Water
Explanation:
The density of the liquid is found by dividing its mass by its volume.
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<h3>mass</h3>
The mass of the liquid is the difference in mass between the full and empty graduated cylinder:
liquid mass = (145 g) -(45 g) = 100 g
<h3>volume</h3>
The cylinder is said to contain 100 mL of the liquid, so that is the volume of interest.
<h3>density</h3>
The ratio of mass to volume is the liquid's density:
ρ = (100 g)/(100 mL) = 1 g/mL
This density identifies the most likely liquid as water.
In order to know how long it has been falling for you take the final velocity "49m/s" and divide it by the acceleration "9.8m/s" and get 5, since you have been using seconds in the calculations the answer is 5 seconds. (Fun fact, it is actually 9.82m/s per second since it accelerates and they rounded it down.)
