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pantera1 [17]
3 years ago
6

Which of the following statements incorrectly describes a scenario where the source of the sound waves and the person hearing th

e sound are remaining stationary? A. The frequency of the sound waves is not affected by the nature of the medium. B. The frequency of the sound waves is not altering as a result of the distance between the sound source and the listener. C. The frequency of the sound waves will change for the listener as a result of the Doppler effect. D. The frequency of the sound waves will remain the same to the listener
Physics
1 answer:
iris [78.8K]3 years ago
8 0
The answer to this question is C.  The reason why this is an incorrect statement is that the Doppler effect takes into account two moving objects.  In this scenario, both the source and the listener are stationary to the frequency of the sound waves will not change due to the Doppler effect.  For the other answers, the frequency of sound waves is not affected by nature of the medium.  The distance between a sound source and listener does not alter the frequency of the sound wave.  The frequency of the sounds waves remains the same to the listener.
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Answer:

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Explanation:

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5 0
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Why isn’t a bird sitting on a high-voltage power line electrocuted? Contrast this with the situation in which a large bird hits
Grace [21]

Answer:

The reason the bird is not electrocuted is due to some facts about circuit:

1. Completeness of circuit- This circuit needs to be

complete in order for current to flow. The bird standing on only one wire has not completed the circuit.

2. A potential difference: Another factor deciding

the direction of flow of current is (electric)

potential. Current always flows from a higher

potential to a lower potential. In other words it

can be said that electrons flow from lower

potential to higher one. (the direction of electric

current is opposite to that of the electrons). So

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flow. The bird standing on only one wire has no potential difference.

3. Path of least Resistance- Factor that decides

the path a current will flow in case of parallel

paths is the (electric) resistance offered by the

path. Current will always flow in the path that

offers least resistance. The leg of a bird has high resistance.

Explanation:

It has no potential difference as both the legs of bird are touching the same wire at same constant potential. ... If the bird would touch the ground while sitting on the wire or flap its wings and touch another electric wire with a different voltage, then it would get shocked and likely die by electrocution.

while in the other hand, the Bird that touches two wires with it wings at the same time will get electrocuted because it has completed a circuit and the its feathers created a potential difference .

8 0
3 years ago
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_____ are placed on dangerous machinery to detect motion, light, heat, pressure, or another stimulus. Their presence helps prote
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Answer;

-Sensors

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Explanation;

-Machinery, safety and factory floor sensors and switches help workers become more productive, efficient, and safe.

-Hazardous machines and systems are frequently equipped with safety elements (safety doors) with a locking mechanism to protect the operator. Their function is to prevent hazardous machine functions if the safety door is not closed and locked and to keep the safety door closed and locked until the risk of injury has passed.

4 0
3 years ago
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Naddika [18.5K]

Explanation:

Initial energy = final energy + work done by friction

PE = PE + KE + W

mgH = mgh + 1/2 mv² + W

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v = 22.1 m/s

Without friction:

PE = PE + KE

mgH = mgh + 1/2 mv²

(800)(9.8)(30) = (800)(9.8)(2) + 1/2 (800) v²

v = 23.4 m/s

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