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2 years ago

If an engine does 660 J of work in 10 seconds, its average power is ...

Physics

1 answer:

givi [52]2 years ago

4 0

Answer:

66w

Explanation:

p=w/t

p=660/10

p=66

prolly a bad explanation but hope it helps...

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An emergency vehicle blowing its siren is moving

Georgia [21]

The frequency produced by the siren is 631.12 Hz

<h3>Doppler effect</h3>

The variation in frequency when a source of sound moves relative to an observer is determined by the doppler effect.

<h3>Frequency of observer</h3>

So, the frequency of the observer f' = (v ± v')f/(v ± v") where

f' = 590 Hz

f = frequency of source or siren ,

v = speed of sound = 330 m/s,

v' = speed of observer = 0 m/s (since you are stationary) and

v" = speed of source = 23 m/s

Since the source moves away from the detector, the sign in the denominator is positive and v' = 0 m/s

So, f' = (v + 0)f/(v + v")

f' = vf/(v + v")

Since, we require the frequency of the source, make f subject of the formula, we have

<h3>Frequency of siren</h3>

f = (v + v")f'/v

Substituting the values of the variables into the equation, we have

f = (v + v")f'/v

f' = (330 m/s + 23 m/s) × 590 Hz/330 m/s

f' = 353 m/s × 590 Hz/330 m/s

f' = 208270 m/sHz/330 m/s

f' = 631.12 Hz

The frequency produced by the siren is 631.12 Hz

Learn more about doppler effect here:

brainly.com/question/2169203

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2 years ago

It is advised not to hold the thermometer by the bulb while reading it

Evgesh-ka [11]

yes is is true cuz when you hold the thermometer by a bulb the heat coming from the bulb will increase the thermometer

6 0

2 years ago

In the author's opinion, why is attitude the most important fitness level factor to consider? (

Cerrena [4.2K]

That's up to you because you have to go through the book to see their expressions

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3 years ago

According to the third law of motion when we put an object, the object pushes back on us with an equal and opposite force. If th

vichka [17]

Hi pupil Here's Your answer :::

➡➡➡➡➡➡➡➡➡➡➡➡➡

Student's justification is not correct. Two equal and opposite force cancel each other if the act on the same body. According to the third law of motion action and reaction forces are equal and opposite but they both act on different bodies. Hence, they cannot cancel each other.

When we push a message track, then the applied force on the truck is not sufficient to overcome the force of friction between the tyres of truck and ground, hence, truck does not move.

⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅⬅

Hope this helps .

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3 years ago

What's a refractive medium that focuses light to a single point?

ss7ja [257]

Answer:

The convex lens is shaped so that all light rays that enter it parallel to its axis cross one another at a single point on the opposite side of the lens.

Explanation:

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3 years ago