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Lapatulllka [165]
4 years ago
12

Which are examples of convection currents ? Select three options.

Physics
2 answers:
antoniya [11.8K]4 years ago
6 0

Answer: A hot air balloon rising and falling in the atmosphere, a radiator that emits warm air and draws in cool air, and rice moving in a pot of water that is being heated. :)

Ksivusya [100]4 years ago
5 0

Answer:

c e and d

Explanation:

i did the test

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12 grams of the isotope carbon-12.

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A book has a mass of 5 lb what is the mass of the book kg
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The mass of the Book is 2.27 kg.
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a races car travels on a circular track at an average rate of 125mi/h the radius of fhe track is 0.320 miles what is that centri
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                                                            390.625
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Why does light refract when it encounters the glass in a lens?
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Read 2 more answers
A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s.
fenix001 [56]

Question

What is the length of the pipe?

Answer:

(a) 0.52m

(b) f2=640 Hz and f3=960 Hz

(c) 352.9 Hz

Explanation:

For an open pipe,  the velocity is given by

v=\frac {2Lf}{n}

Making L the subject then

L=\frac {nV}{2f}

Where f is the frequency,  L is the length,  n is harmonic number,  v is velocity

Substituting 1 for n,  320 Hz for f and 331 m/s for v then

L=\frac {1*331}{2*320}=0.5171875\approx 0.52m

(b)

The next two harmonics is given by

f2=2fi

f3=3fi

f2=3*320=640 Hz

f3=3*320=960 Hz

Alternatively, f2=2\times \frac {v}{2L} and f3=3\times \frac {v}{2L}

f2=2\times \frac {331}{2*0.52}=636.5 Hz\\f3=3\times \frac {331}{2*0.52}=954.8 Hz

(c)

When v=367 m/s then

f1= \frac {v}{2L}\\f1= \frac {367}{2*0.52}=352.9 Hz

5 0
3 years ago
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