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Lerok [7]
3 years ago
9

What is the speed of sound in air when the temperature is 20°C?

Physics
2 answers:
Anarel [89]3 years ago
5 0
The answer to your question is 343 m/s
Minchanka [31]3 years ago
4 0

Answer:

The speed of sound in air when the temperature is 20°C is 343 m/s.

Explanation:

Given that,

Temperature T = 20°C = 20+273=293 K

The speed of sound in air is the distance traveled divided by time.

We know that,

The relation between the speed of sound in air and temperature is defined as:

v= 331\sqrt{\dfrac{T}{273}}

Where, T = temperature in Kelvin

v = speed of sound in air

We substitute the value into the formula

v = 331\sqrt{\dfrac{293}{273}}

v = 342.9 = 343\ m/s

The speed of sound in air is 331 m/s at 0° C, 343 m/s at 20°C and 346 m/s at 25°C.

Hence, the speed of sound in air when the temperature is 20°C is 343 m/s.

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Hope this helps.

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You stand on a frictional platform that is rotating at 1.8 rev/s. Your arms are outstretched, and you hold a heavy weight in eac
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Answer:

20.62361 rad/s

489.81804 J

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As the angular momentum of the system is conserved

I_i\omega_i=I_f\omega_f\\\Rightarrow \omega_f=\dfrac{I_i\omega_i}{I_f}\\\Rightarrow \omega_f=\dfrac{9.3\times 1.8}{5.1}\\\Rightarrow \omega_f=3.28235\ rev/s=3.28235\times 2\pi=20.62361\ rad/s

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Change in kinetic energy is given by

\Delta K=\dfrac{1}{2}(I_f\omega_f^2-I_i\omega_i^2)\\\Rightarrow \Delta K=\dfrac{1}{2}(5.1\times (20.62361)^2-9.3\times (1.8\times 2\pi)^2)\\\Rightarrow \Delta K=489.81804\ J

The change in kinetic energy of the system is 489.81804 J

As the work was done to move the weight in there was an increase in kinetic energy

6 0
3 years ago
A soccer player kicks a ball, applying a force of 1,000 newtons over a distance of 0. 2 meter. The ball travels 50 meters down t
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500 i think i’m wrong though
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Sarah and Maisie are analysing data from their school sports day. Looking at the 1500 m results for Stephen, Maisie believes tha
Dahasolnce [82]

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Sarah is right

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A scalar is a number, instead a vector is a number that represents the module in addition to direction and sense.

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4 0
3 years ago
Which of the following statements about iron filings placed upon glass resting on top of a bar magnet is false?
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