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Rus_ich [418]
3 years ago
8

In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving sourc

e of sound. This is now known as Doppler’s law or the Doppler effect. What does this law state? A) The loudness of a moving source of sound is independent of the observer. B) The frequency of a moving source of sound is independent of the observer. C) The loudness of a moving source of sound is greater as it approaches an observer. D) The frequency of a moving source of sound is greater as it approaches an observer.
Physics
1 answer:
Lostsunrise [7]3 years ago
5 0

Answer:  D) The frequency of a moving source of sound is greater as it approaches an observer.

Explanation:

Doppler effect occurs when there is relative motion between source of sound and observer. The apparent frequency observed by observed is different from the actual frequency of the sound emitted from the source.

When the source and observer move closer, the apparent frequency is greater and when moving away, it is less than the actual frequency. Thus, the correct option is D.

The loudness is dependent on the amplitude of the sound which remains same.

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As a car moves along the road, the distance traveled each second is measured and recorded. What is the
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You live on a planet far from ours. "Based on extensive communication with a physicist on earth", you have determined that all l
Ugo [173]

Answer:

8.56 m/s2

Explanation:

Using law of energy conservation while taking into account of the rotational and translation kinetic energy, when the solid cylinder rolls down the incline we have the potential energy converted to kinetic energy:

E_p = E_{kv} + E_{k\omega}

mgh = mv^2/2 + I\omega^2/2

where m is the mass, I = mr^2/2 is the moments of inertia of the solid cylinder \omega = v / r is the angular speed of the cylinder

mgh = mv^2/2 + \frac{mr^2}{2}\frac{(v/r)^2}{2}

mgh = mv^2/2 + mv^2/4 = 3mv^2/4

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The gravitational acceleration on this planet is 8.56 m/s2

3 0
3 years ago
A 0.40-kg particle moves under the influence of a single conservative force. At point A, where the particle has a speed of 10 m/
yan [13]

Answer:

The value of the potential energy of the particle at point B is 85 joules.

Explanation:

According to the Principle of Energy Conservation, the energy cannot be created nor destroyed, only transformed. The particle at point A has kinetic and potential energy and receives a work due to an external conservative force (Work-Energy Theorem), whose sum is equal to potential energy at point B. Mathematically speaking, the expression that describes the phenomenon is:

K_{A} + U_{A} + W_{A \rightarrow B} = U_{B}

Where:

K_{A} - Kinetic energy at point A, measured in joules.

U_{A} - Potential energy at point A, measured in joules.

W_{A \rightarrow B} - Work due to conservative force from A to B, measured in joules.

U_{B} - Potential energy at point B, measured in joules.

The initial kinetic energy of the particle is:

K_{A} = \frac{1}{2}\cdot m \cdot v^{2}

Where:

m - Mass, measured in kilograms.

v - Velocity, measured in meters per second.

If m = 0.4\,kg and v = 10\,\frac{m}{s}, then:

K_{A} = \frac{1}{2}\cdot (0.4\,kg)\cdot \left(10\,\frac{m}{s} \right)^{2}

K_{A} = 20\,J

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U_{B} = 20\,J + 40\,J + 25\,J

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How do particles move in a transverse wave​
Brrunno [24]

Answer:

yes

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