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n200080 [17]
3 years ago
16

A student hears a police siren. What would change the frequency that the student hears? Check all that apply.

Physics
2 answers:
BlackZzzverrR [31]3 years ago
9 0

Answer:

1

2

3

4

Explanation:

It's right on Edge

ser-zykov [4K]3 years ago
4 0
<span>A student hears a police siren.

The arithmetic of the Doppler Effect shows that if the distance between
the source and observer is changing, then the observer hears a different
frequency compared to the frequency actually radiating from the source. 

Thus the first four choices would cause the student to hear a different
frequency:

-- if the student walked toward the police car
-- if the student walked away from the police car
-- if the police car moved toward the student
-- if the police car moved away from the student

The last two choices wouldn't affect the frequency heard by the student,
since the perceived frequency of a sound doesn't depend on its intensity.

-- if the intensity of the siren increased
-- if the intensity of the siren decreased.</span>
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A magnetic field with the same orientation as the Earth's field is said to
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Answer: Normal polarity

Explanation:

Magnetic field in line with the earth field is said to have polarity.

If the magnetic field is in opposite direction with the earth's field, then, the polarity is said to be a reversed polarity.

But since the magnetic field is with the same orientation as the Earth's field, it is said to have normal polarity.

6 0
3 years ago
Our milky way galaxy is 100000 lyly in diameter. a spaceship crossing the galaxy measures the galaxy's diameter to be a mere 1.
Sidana [21]

The speed of the spaceship relative to the galaxy is 0.99999995c.

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The Milky way galaxy is 100,000 light years in diameter.

The galaxy's diameter is a mere 1. 0 ly.

We know that ;

L = L_0 \sqrt{1-\frac{v^2}{c^2} }

L = 1 light year

L₀ = 100,000 light year

1 = 100,000 \sqrt{1-\frac{v^2}{c^2} }

1 = 100,000 \sqrt{1-\frac{v^2}{(3*10^8)^2} }

\frac{1}{100,000}  = \sqrt{1-\frac{v^2}{c^2} }

v = 0.999999995 c

Therefore, the speed of the spaceship relative to the galaxy is 0.99999995c.

Learn more about a light year here:

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5 0
2 years ago
What is momentum equal to
Margarita [4]

Answer:

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Velocity is the rate of change of displacement with time.

Also, momentum is used to quantify the particular amount of motion a body can give.

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3 years ago
based on the creation of natural elements, what is most likely to be important to the modern iroquois culture?
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They used reeds to make baskets and they used animal hides as clothing.

The Iroquois made weapons out of bones, wood, stones, and feathers. The Iroquois used wood, stone and feathers to make arrows.Hunting tools were a bow and arrow, tomahawks and clubs.

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If one m³ of that material holds 4,000 kg of it,
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4 years ago
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