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mafiozo [28]
3 years ago
10

What causes waves to slow down: change in wave’s wavelength or change in its frequency and y?

Physics
1 answer:
Mashutka [201]3 years ago
3 0

Answer:

Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes.

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A.

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What is physical quantity​
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two less protons and 4 less mass units

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3 years ago
A high-speed flywheel in a motor is spinning at 500 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and
jekas [21]

Answer:

Part a)

\omega_f = 31.4 rad/s

\omega_f = 300 rpm

Part b)

t = 75 s

N = 311.5 revolutions

Explanation:

Initial speed of the flywheel is given as

f_1 = 500 rpm

initial angular speed is given as

\omega_i = 2\pi(\frac{500}{60})

\omega_i = 52.35 rad/s

Number of revolutions

N = 200

angular displacement is given as

\theta = 2N\pi

\theta = 2(200)\pi = 1256.6 rad

now we have

\theta = \omega_i t + \frac{1}{2}\alpha t^2

1256.6 = 52.35(30) + \frac{1}{2}\alpha (30)^2

\alpha = -0.7 rad/s^2

Part a)

final angular speed of the wheel is given as

\omega_f = \omega_i + \alpha t

\omega_f = 52.35 - 0.7(30)

\omega_f = 31.4 rad/s

\omega_f = 300 rpm

Part b)

If the final angular speed becomes zero then time taken by the wheel is given as

\omega_f - \omega_i = \alpha t

0 - 52.35 = -0.7 t

t = 75 s

Now total number of revolution that it makes is given as

N = \frac{\omega_f + \omega_i}{4\pi} t

N = \frac{52.35 + 0}{4\pi} (75)

N = 311.5 revolutions

5 0
3 years ago
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