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Nonamiya [84]
3 years ago
5

What are you doing when you’re making sound? A. Causing air molecules to vibrate. B Causing photons to travel. C Causing air pre

ssure to drop. D Causing electromagnetic waves to radiate.
Physics
1 answer:
Greeley [361]3 years ago
5 0

Answer: A

Causing air molecules to vibrate

Explanation:

Sound is made by vibrations. And it is an energy. When any object vibrates, it causes movement in the air particles. These particles bump into the particles close to them, which makes them vibrate too causing them to bump into more air particles. This movement, called sound waves, keeps going until they run out of energy.

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Una bala calibre se deja caer desde el piso 84 (a una altura de 250 metros) La bala tiene una masa de 0,008 kg. ¿A qué velocidad
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Answer:

50

Explanation:

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A force of 1 newton will cause a mass of 1 kg to have an acceleration of 1 m/s^2. If a force of 5 newtons is applied to a mass o
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For any force and any mass, the acceleration is always

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3 years ago
A heat engine is operating on a Carnot cycle and has a thermal efficiency of 47 percent. The waste heat from this engine is reje
Fantom [35]

Answer:

Explanation:

Given that,

Efficiency of Carnot engine is 47%

η =47%=0.47

The wasted heat is at temp 60°F

TL=60°F

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Therefore, rate of heat loss QL is

QL' = 800×60 =48000

The power output is determined from rate of heat obtained from the source and rate of wasted heat.

Therefore,

W' = QH' - QL'

Note QH' = QL' / (1-η)

W' = QL' / (1-η) - QL'

W'=QL' η / (1-η)

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b. Temperature at source

Using ratio of wanted heat to temp

Then,

TH / TL = QH' / QL'

TH = TL ( QH' / QL')

Since, QH' = QL' / (1-η)

Then, TH= TL( QL' /QL' (1-η))

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°R=°F+459.67

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TH=980.51R

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