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Nataly [62]
3 years ago
11

When energy is transferred from one part of a system to another, some of the

Physics
1 answer:
allsm [11]3 years ago
8 0

Answer:

the correct answers are A. friction between a car‘s tires on the road produce heat.

And E. Power lines heat up as electricity flows through them.

Explanation:

Explanation, APEX

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You are trying to overhear a juicy conversation, but from your distance of 20.0 m , it sounds like only an average whisper of 30
12345 [234]

Answer:

r₂ = 0.2 m

Explanation:

given,

distance = 20 m

sound of average whisper = 30 dB

distance moved closer = ?

new frequency = 80 dB

using formula

\beta = 10 log(\dfrac{I_1}{I_0})

   I₀ = 10⁻¹² W/m²

now,

30 = 10 log(\dfrac{I_1}{10^{-12}})

\dfrac{I_1}{10^{-12}}= 10^3

I_1= 10^{-8}\ W/m^2

to hear the whisper sound = 80 dB

80 = 10 log(\dfrac{I_2}{10^{-12}})

\dfrac{I_2}{10^{-12}}= 10^8

I_2= 10^{-4}\ W/m^2

we know intensity of sound is inversely proportional to square of distances

\dfrac{I_1}{I_2}=\dfrac{r_2^2}{r_1^2}

\dfrac{10^{-8}}{10^{-4}}=\dfrac{r_2^2}{20^2}

10^{-4}=\dfrac{r_2^2}{20^2}

  r₂ = 0.2 m

6 0
4 years ago
Definition of fluoresence
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Answer:

the property of absorbing light of short wavelength and emitting light of longer wavelength.

Explanation:

YW

4 0
3 years ago
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How many states in the world are there?​
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There are 193 member states. The UN recognises 206 states altogether.

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If a car is moving to the left with constant velocity, one can conclude that If a car is moving to the left with constant veloci
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Answer:

Explanation:

If a car is moving to the left with constant velocity, one can conclude that

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Since there is no acceleration ,no net force is applied , hence no force acts on the car.

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4 years ago
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