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iris [78.8K]
3 years ago
6

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

of dark energy:
A) recollapsing universe
B) coasting universe
C) critical universe
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).
Physics
1 answer:
Keith_Richards [23]2 years ago
3 0

Answer:

1. Recollapsing universe

2. Critical universe

3. Coasting universe

Explanation:

Recollapsing universe has dark matter density greater than critical density. While critical universe has its matter density equal to the critical sensity. Coasting universe on the other hand has much smaller matter density compared to critical density.

Note that the critical density is approximately 10^-20 grams/cm3

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You have gas in a container with a movable piston. The walls of the container are thin enough so that its temperature stays the
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Answer:

New pressure of the gas increases by 26.5% with respect to initial pressure, new volume decreases 27% with respect to initial volume and new temperature decreases 8% with respect to initial volume.

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If we assume the gas is a perfect gas we can use the perfect gas equation:

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\frac{P_{3}V_{3}}{T_{3}}=\frac{P_{4}V_{4}}{T_{4}} (5)

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P_{4}=1.15*1.1P_{1}=1.265P1

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T_{4}=1.15*0.8T_{1}=0.92T1

The new temperature decreases 8% with respect to initial volume.

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Read 2 more answers
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