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4 years ago

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

Physics

2 answers:

Anarel [89]4 years ago

5 0

The answer to your question is 343 m/s

Minchanka [31]4 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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Samantha and Emily are pushing a box of textbooks in the same direction across their classroom. Samantha is applying a force of

likoan [24]

Answer:

20N

Explanation:

Force applied by Samantha = 10N

Force applied by Emily = 10N

Since both Samantha pushes the box of textbook in the same direction; their forces are additive.

Net force applied on box = Force applied by Samantha + Emily

Force is a pull or push on a body

Net force = 10N + 10N = 20N

4 0

4 years ago

What evidence best supports the theory that the universe began with a massive explosion?; What supports the theory that the univ

kompoz [17]

The beginning of the universe is from the big bang which is a massive explosion.

The Big Bang is the moment when the universe began 13.8 billion years ago with the explosion of a small, dense fireball. However, what caused the explosion in the first place remains a mystery.

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In 1929, Edwin Hubble provided the first observational evidence that the age of the universe is finite. Using the largest telescope of its time, he discovered that the farther away a galaxy is from us, the more it appears that the space is expanding from us in all directions.

Learn more about the big bang in

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6 0

1 year ago

13. A lever does 5.0 J of work on a 0.10-kg ball bearing in a pinball machine. The ball's

shusha [124]

Answer:

The resulting speed of the ball is;

10 m/s

Explanation:

The given parameters are;

The amount of work done by the lever = 5.0 J

The mass of the ball on which the work is done, m = 0.10 kg

By the principle of conservation of energy, we have;

The work done by the lever = The kinetic energy. K.E., gained by the ball

The kinetic energy, K.E., is given by K.E. = 1/2·m·v²

Where, for the ball, we have;

m = The mass of the ball

v = The resulting speed of the ball

Therefore, by substituting the known values, we have;

The work done by the lever = 5.0 J = The kinetic energy. K.E., gained by the ball = 1/2 × m × v² = 1/2 × 0.10 kg × v²

∴ 5.0 J = 1/2 × 0.10 kg × v²

v² = 5.0 J/(1/2 × 0.10 kg) = 100 m²/s²

v = √(100 m²/s²) = 10 m/s

The resulting speed of the ball, v = 10 m/s.

6 0

3 years ago

An object weighs 32 newtons. What is its mass if a gravitometer indicates that g = 8.25 m/s2?

Nata [24]

Answer:

3.88kg

Explanation:

From the question given, we obtained the following data:

W = 32N

g = 8.25 m/s2

M =?

W = M x g

M = W/g

M = 32/8.25

M = 3.88Kg

The mass of the object is 3.88kg

3 0

4 years ago

8 POINTS AND MARK BRAINIEST:

lesya692 [45]

The answer is A i just took the test.

3 0

3 years ago

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