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valentina_108 [34]
3 years ago
12

The speed of sound in an ideal gas is given by the relationship v = γRTM−−−−√ , where R - the universal gas constant = 8.314 J/m

ol⋅K ; T - the absolute temperature; M - the molar mass of the gas in kg/mol ; and γ is a characteristic of the specific gas. For air, γ = 1.4. Calculate the speed of sound in the air. Assume that air is 20% oxygen and 80% nitrogen and the temperature of air is 293 K . Express your answer to two significant figures and include the appropriate units.
Part B

While camping, you record a thunderclap whose intensity is 10−2 W/m2 . The clap reaches you 3.0 s after a flash of lightning. Assume that the thunder radiates spherically from its source. Estimate the total acoustical power generated by the bolt of lightning. Express your answer to two significant figures and include the appropriate units.
Physics
1 answer:
Anna71 [15]3 years ago
4 0

Answer:

Explanation:

1.) v=\sqrt{\frac{yRT}{m} } \\\\=\sqrt{\frac{1.4\times8.3\times293}{0.029} }\\\\=342.64m/s

2.) 4\pi r^2I=P\\\\\\P=4\pi(vt)^2I=4\pi (342.64\times3)^2(10^{-2})=1.33\times10^5watt

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A firework is ignited, and explodes with a flash and a loud bang as it is blown apart. The system consists of: the firework, the
butalik [34]

The complete question is:

Study the scenario. A firework is ignited, and explodes with a flash and a loud bang as it is blown apart. The system consists of: the firework, the earth, and the air. which choice best describes how energy is transformed in the system?

A) When the firework is ignited, a chemical reaction absorbs energy from the surrounding environment. the energy is in several forms including sound and light, and mechanical energy of the fragments of the firecracker that are launched through the air. Eventually all the energy released is transformed into thermal energy.

B) When the firework is ignited, a chemical reaction releases energy in several forms, including sound, light, and the mechanical energy of the fragments being launched through the air. Eventually all the energy released is transformed into mechanical energy.

C) When the firework is ignited, a chemical reaction releases energy in several forms, including sound, light, and the mechanical energy of the fragments being launched through the air. Eventually all the energy released is transformed into thermal or mechanical energy.

D) When the firework is ignited, a chemical reaction absorbs energy from the surrounding environment. The energy is taken in in several forms including sound and light, and mechanical energy of the fragments being launched through the air. Eventually all the energy is transformed into thermal energy.

Answer:

C) When the firework is ignited, a chemical reaction releases energy in several forms, including sound, light, and the mechanical energy of the fragments being launched through the air. Eventually all the energy released is transformed into thermal or mechanical energy.

Explanation:

Energy is released from the system, not absorbed.

All the sound, light and movement of the debris is as a result of energy transformation from the chemical energy.

Eventually, most of the energy are finally wasted away as heat energy.

Some of the energy is used up by the flying particles from the fireworks.

8 0
3 years ago
Question 2: In 2-4 sentences, explain what would happen to the cell if the nucleus didn’t work?
VladimirAG [237]

Answer:

Then the cell won't be able to function properly. With no nucleus the cell will lose control. It won't know what to do and there will be no cell division.

Explanation:

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2 years ago
A rocket takes off from Earth. It travels 825km in 75 seconds. What is the
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Answer:

11 km/s

Explanation:

v=s/t

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v=11km/s

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3 years ago
Acar accelerates from 4 meters/second to 16 meters/second in 4 seconds. The car's acceleration is
s2008m [1.1K]

To understand this question, you need to understand the concept of acceleration first. Have you ever been in a car and noticed that it was getting faster and faster? That "speeding up" of the car is known as acceleration! Acceleration is essentially the rate at which you speed up.

Okay, so we now know what acceleration is. What are its units? The unit of acceleration is the change in velocity over a period of time: \frac{∆v}{t}

If you haven't learned about velocity yet, just think about it as speed for now. The funny-looking triangle, ∆, is a symbol for "the change of." For example, if I started walking at 3 \frac{feet}{second} then sped up to 5 \frac{feet}{second}, then the change in my speed would be 2 \frac{feet}{second}, because I started walking 2 \frac{feet}{second} faster!

Okay, enough with all the explanations. Hopefully, you understand the units now. Let's take a look at the question. A car accelerates from 4 \frac{meters}{second} to 16 \frac{meters}{second}  in 4 seconds. What would the acceleration be? Let's set up an equation:

a = \frac{∆v}{t}

a is the acceleration, ∆v is the change in velocity, and t is the time elapsed.

Now, let's plug in our values! ∆v is the change in velocity, and to find that we simply have to subtract 16 \frac{meters}{second} by 4 \frac{meters}{second}. That makes sense, right? Back to the equation.

a = \frac{∆v}{t}
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(16 - 4 is the change in velocity, and 4 is the number of seconds the car was accelerating)

a = \frac{12}{4}

a = 3 (\frac{meters}{second^{2}})

We have our answer! The car's acceleration is 3 meters per second^{2}.

(You might be thinking: Wait. Meters per second squared? The reason for that is because acceleration is the rate at which the speed increases! That makes the unit \frac{\frac{meters}{second}}{second}, which can be simplified down to \frac{meters}{second^{2} })

Let me know if you need clarification on anything I explained here!
- breezyツ

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Alla [95]
Freezing point of the water is known as 273 K

Hope this helps!
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