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svlad2 [7]
2 years ago
12

What happens when an airplane is flying faster than the speed of sound

Physics
1 answer:
AveGali [126]2 years ago
5 0

Answer:

At supersonic speeds (those greater than the local sound speed), there is no sound heard as an object approaches an observer because the object is traveling faster than the sound it produces. Only after the object has passed will the observer be able to hear the sound waves emitted from the object.

Explanation:

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.A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 angle to the horizontal. The forc
Ainat [17]

To solve this problem, it is necessary to apply the concepts related to Work according to the Force and distance, as well as the concepts related to energy lost-or gained-by heat. Mathematically the energy corresponding to heat is given as:

Q = mC_p(\Delta T)

Where,

m = mass

C_p= Specific heat

\Delta T = Change in Temperature

At the same time the Work made by the Force and the distance is given as:

W = F*d \rightarrow W=mg*d

As the force is applied at an angle of 30 degrees, the efficient component would be given by the vertical then the work / energy would be determined as:

W = mg*dsin(30)

W = (15m)(0.2kg)(9.81)(sin30)

W = 13.24J

Now this energy is used to heat the aluminum. We can find the change at the temperature as follow:

Q = mC_p(\Delta T)

13.24 = (0.2)(900)(\Delta T)

\Delta T = 0.0736 \°C

Therefore the correct answer is B.

7 0
3 years ago
A star has a spectrum shift exhibiting a red shift. What can you conclude about the distance from earth to that star
Akimi4 [234]
Red shift in the spectrum of a star is always taken to mean that the source of the light is moving away from us.

That's the whole basis for the notion of the expanding universe, since we don't know of any other mechanism that can shift light toward longer wavelengths.
6 0
3 years ago
Read 2 more answers
1) How much work is done when a force of 50N<br> pulls a wagon 20 meters?
katrin2010 [14]

Answer:

100J

Explanation:

50N*20m=100J

N*m=J(joule)

4 0
2 years ago
The least penetrating form of radiation is _____.
vichka [17]
Alpha radiation, i just took a quiz and this was the answer, hope it helps :)
5 0
3 years ago
A car travels 100 km to the east. If the first half of the distance is driven at 50 km/h and the second half at 100 km/h, what i
Lina20 [59]

First half:

50 km at 50 km/hr ... 1 hour

Second half:

50 km at 100 km/hr ... 1/2 hour

Total distance = 100 km

Total time = 1.5 hours

Average speed = (100 km) / (1.5 hrs)

Average speed = 66 and 2/3 km/hr

Average velocity = 66 and 2/3 km/hr East

8 0
3 years ago
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