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Tom [10]
2 years ago
5

Listed following are three possible models for the long-term expansion (and possible contraction) of the universe in the absence

of dark energy. Rank each model from left to right based on the ratio of its actual mass density to the critical density, from smallest ratio (mass density much smaller than critical density) to largest ratio (mass density much greater than critical density).1. coasting universe2. recollapsing universe3. critical universe
Physics
1 answer:
vazorg [7]2 years ago
8 0

Answer:

do your best

Explanation:

<u>babyboiiii∛√</u>

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Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
pshichka [43]
The hydrogen and oxygen atoms regroup into a new molecule.

Hope this helps!!
6 0
2 years ago
A 5 kg object is moving in a straight-line with an initial speed of v m/s. It takes 13 s for the speed of the object to increase
coldgirl [10]

The object's kinetic energy changes according to

d<em>K</em>/d<em>t</em> = 15 J/s

If <em>v</em> is the object's initial speed, then its initial kinetic energy is

<em>K</em> (0) = 1/2 (5 kg) <em>v</em> ²

Use the fundamental theorem of calculus to solve for <em>K</em> as a function of time <em>t</em> :

K(t) = K(0) + \displaystyle\int_0^t \left(15\frac{\rm J}{\rm s}\right)\,\mathrm du = \dfrac12 (5\,\mathrm{kg}) v^2 + \left(15\dfrac{\rm J}{\rm s}\right)t

After <em>t</em> = 13 s, the object's kinetic energy is

<em>K</em> (13 s) = 1/2 (5 kg) (13 m/s)² = 422.5 J

Put this as the left side in the equation above for <em>K(t)</em> and solve for <em>v</em> :

422.5\,\mathrm J = \dfrac12 (5\,\mathrm{kg}) v^2 + \left(15\dfrac{\rm J}{\rm s}\right)(13\,\mathrm s)

==>   <em>v</em> ≈ 9.5 m/s

8 0
2 years ago
Which event best helped becquerel determine uranium radiate rays?
agasfer [191]
Exposure of a Photographic plate to Uranium in a closed space along with a metal that prevented the rays from passing through best helped becquerel determine Uranium radiates rays.
6 0
2 years ago
Two students, Jordan and Taylor, are talking about light. Jordan says that light behaves as a stream of particles. Taylor declar
FrozenT [24]

Answer:

"Both students are correct. When light is traveling through small openings, solids, liquids, gases, or a vacuum, it behaves like a wave. When it interacts with matter, it acts like a stream of particles."

Explanation:

just got it right

3 0
2 years ago
Agility refers to a person's level of flexibility.
tekilochka [14]
False, agility is more about how fast you are
7 0
3 years ago
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