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3 years ago

The ____ is a particle with one unit of positive change

Physics

2 answers:

Rasek [7]3 years ago

7 0

Answer:

a proton because it has a positive charge

Illusion [34]3 years ago

6 0

Answer:

The answer is

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At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.5 atm pressure an

quester [9]

Answer:

$\vartheta = 41.31 GHz$

Given:

Pressure, $P_{O} = 1.5 atm = 1.5\times 10^{5} Pa$

Temperature, T = $- 0.77^{\circ}$ = 273 + (- 0.77) = 272.23 K

Diameter of oxygen molecule, $d_{O} = 8.4\times 10^{- 8} cm = 8.4\times 10^{-10} m$

Speed of sound, v = 330 m/s

$k_{B} = 1.38\times 10^{- 23} J/s$

Solution:

Mean free path of oxygen is given by:

$L_{O} = \frac{k_{B}T}{\sqrt{2}P_{O}\pi d_{O}^{2}}$

Now, substituting the given values in the above formula:

$L_{O} = \frac{1.38\times 10^{- 23}\times 272.23}{\sqrt{2}\times 1.5\times 10^{5}\pi\times (8.4\times 10^{- 10})^{2}}$

$L_{O} = 7.99\times 10^{-8} m$

Now, the frequency, $\vartheta$ is given by:

$\vartheta = \frac{c}{\lambda}$

Since, mean free path = wavelength = $7.99\times 10^{-9} m$

Therefore,

$\vartheta = \frac{v}{L_{O}}$

$\vartheta = \frac{330}{7.99\times 10^{-8}}$

$\vartheta = 4.131\times 10^{10} Hz = 41.31 GHz$

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3 years ago

A dog walks 12 meters to the west and then 16 meters back to the east

Anna71 [15]

Answer:

Explanation:

4 meters east

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3 years ago

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Question 11

kotykmax [81]

Answer:fission

Explanation:

All nuclear power plants rely on fission to generate power

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3 years ago

A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4. 5 m/s. What is the car’s change in momentum d

kodGreya [7K]

Answer:

Explanation:

Change in car's momentum = 700 * [4.5 - {-29)] = 23,450 kgm/s

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3 years ago

Which of these models of the solar system first proved that the sun is at the center of the solar system?

Anarel [89]

I believe it was Copernicus' heliocentric model.

heliocentric - the sun is at the center and the planets revolve around it.

hope this helps :)

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3 years ago

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