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Misha Larkins [42]
3 years ago
9

Solid to gas and gas to solid on the basis of kinetic model.​

Physics
1 answer:
k0ka [10]3 years ago
4 0

Explanation:

The kinetic molecular theory of matter states that: ... The average amount of empty space between molecules gets progressively larger as a sample of matter moves from the solid to the liquid and gas phases. There are attractive forces between atoms/molecules, and these become stronger as the particles move closer together.

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Answer:

False, true

Explanation:

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An ore car of mass 39000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 19 m lower vert
cupoosta [38]

Answer:

The compression in the spring is 5.88 meters.                

Explanation:

Given that,

Mass of the car, m = 39000 kg

Height of the car, h = 19 m

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mgh=\dfrac{1}{2}kx^2

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x=\sqrt{\dfrac{2mgh}{k}} \\\\x=\sqrt{\dfrac{2\times 39000\times 19\times 9.8}{4.2\times 10^5}} \\\\x=5.88\ m

So, the compression in the spring is 5.88 meters.                                                                                                                  

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12)A black body is heated from 27°C to 127° C. The ratio of their energies of radiations emitted will be
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Answer:

81:256.

Explanation:

Let T denote the absolute temperature of this object.

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T(\text{before}) = 27 + 273 = 300\; \rm K.

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By the Stefan-Boltzmann Law, the energy that this object emits (over all frequencies) would be proportional to T^4.

Ratio between the absolute temperature of this object before and after heating:

\displaystyle \frac{T(\text{before})}{T(\text{after})} = \frac{3}{4}.

Therefore, by the Stefan-Boltzmann Law, the ratio between the energy that this object emits before and after heating would be:

\displaystyle \left(\frac{T(\text{before})}{T(\text{after})}\right)^{4} = \left(\frac{3}{4}\right)^{4} = \frac{81}{256}.

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What does the letter I represent?
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The letter i is used to signify that a number is an imaginary number. It stand for the square root of negative one.
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