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timurjin [86]
3 years ago
5

A 2500-kg car falls over a cliff and converts 1000,000J of PE into KE.

Physics
1 answer:
MArishka [77]3 years ago
7 0

B is correct makes more sense

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3 years ago
A whistling sound that is audible when a hearing aid is held in the hand with the power on and the volume high indicates that th
zzz [600]

The whistling sound from the hearing aids represents that your hearing aids is working perfectly ad is known as the "feedback". So, the given statement is true.

Answer: Option A

<u>Explanation:</u>

It's often sounds irritating when a hearing aids of your grandpa or Grandma whistles. especially, when they put them out of their ears. Actually, this feedback sound from hearing aids occur when the sounds from the outer side  bounces back to the microphone of the hearing aids.

The sound bounces back when it doesn't gets inside of your ear canal so that one can hear the sound through the hearing aid. When the sounds bounces back in the hearing aid, it get re-amplified and thus we hear the whistle sound which is known as the feedback of the device.

It's not always the feedback sound though. Sometimes the device whistles when it has some mechanical defect or when one hugs the other one or water gets inside and damaged the whole system.

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3 years ago
20. A semiconductor is a
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Examples of semiconductors are silicon, boron, carbon, germanium, arsenic etc.

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Just like energy is <br> matter is lost through an ecosystem
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