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Allushta [10]
3 years ago
13

Why can gases and liquids both transmit heat by convection?

Physics
2 answers:
defon3 years ago
6 0

Answer:

A. Their particles are free to move away from each other.

Explanation:

DochEvi [55]3 years ago
4 0

Answer:

Gases and liquids both transmit heat by convection because <u><em>their particles are free to move away from each other (option A).</em></u>

Explanation:

Convection is a process in which heat is transferred between two liquid substances, between two gaseous substances or a gas and a liquid when they are at different temperatures. The heat flux is produced from the body with the highest temperature to the substance with the lowest temperature.

The transmission of heat by convection is based on the actual movement of the molecules of a substance. Both liquids and gases are considered fluids where their particles are free to move away and move from each other. In solids particles vibrate around fixed positions and have a fixed volume .

<u><em>Gases and liquids both transmit heat by convection because their particles are free to move away from each other (option A).</em></u>

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Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a
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Answer:

37.545 m/s

Explanation:

f' = Actual frequency of horn = 269 Hz

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v_s = Speed of first train

From Doppler effect we have

f=f'\dfrac{v-v_0}{v-v_s}\\\Rightarrow v_s=v-\dfrac{f'}{f}(v-v_0)\\\Rightarrow v_s=343-\dfrac{269}{290}(343-13.7)\\\Rightarrow v_s=37.545\ m/s

The speed of the first train is 37.545 m/s

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3 years ago
A student on an amusement park ride moves in circular path with a radius of 3.5 m once every 4.5 s. What is the tangential veloc
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Answer:

the tangential velocity of the student is 4.89 m/s.

Explanation:

Given;

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The tangential velocity of the student is calculated as follows;

v = \frac{2\pi r}{t} \\\\v = \frac{2 \pi \times 3.5}{4.5} \\\\v = 4.89 \ m/s

Therefore, the tangential velocity of the student is 4.89 m/s.

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