An ultrasound system can produce images of body structures because sound waves

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Answer 1
Answer: travel at different speeds through materials of different densities.

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Imagine that a car is traveling from your left to your right at a constant velocity. Which two actions could the driver take that may be represented as (a) a velocity vector and an acceleration vector both pointing to the right and then (b) changing so the velocity vector points to the right and the acceleration vector points to the left?

Two objects, one with a mass of 2 kg and one with a mass of 3 kg are attracted to each other by a gravitational force. If the force on one mass is 4 N, what is the force on the other mass?

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By Newton's 3rd law: That for every action there is an equal and opposite reaction.

So if force on one mass is 4N, then the force on the other mass is -4N.

The driver of a car is driving the car very fast.The car hits a crash barrier and stops very quickly.
Describe why the driver is injured.

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because the persons head is probably slammed into some part of the car and that means that the persons slammed on the brakes really hard so the person is probably injured
i hope this helps

The momentum of the car is probably very large before.When it crashes. the momentum changes suddenly in a short period of time.
Rate of change of momentum = Force

So, as the momentum changes in a very short period of time, the force exerted on the driver is very large.So, he gets injured

Current can also be calleda. voltage.
b. electricity.
c. moving charges.
d.
b. and
c.

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Electrical current is the flow of moving charges.
D. It is electricity and moving charges

The first scientest that proposed that all things are made up of atoms

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John Dalton I believe.

What does the doppler effect indicate about the motion of galaxies?

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When galaxies move farther away the wavelength of the light is longer causing the galaxy to shift red but if it moves closer, the wavelength of the light gets smaller causing the galaxy to blue shift. The reason that the wavelength increases or decrease is due to the doppler effect.

A series circuit contains four light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. Then the switch is closed again. What would you expect to see?A) All three remaining light bulbs will be on.
B) None of the remaining light bulbs will be on.
C) Only the bulb closest to the switch will be on.
D) All three remaining light bulbs will be brighter than before.

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The correct answer is option B) None of the remaining light bulbs will be on.

What will happen if one light bulb is removed from a series circuit?

In a series connection when a bulb is removed, it will be creating a open circuit. Since the circuit is series and is open at a point current will not flow and hence the other bulb will not glow.

Why did the series circuit stop working when one of the light bulbs was removed?

That's because the basic requirement for the circuit to operate a continuous, closed-loop path is no longer met. This is the main disadvantage of a series circuit. If any one of the light bulbs or loads burns out or is removed, the entire circuit stops operating.

Learn more about the series circuit here: brainly.com/question/19865219

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for series circuit, components are in the same path. removing component, the path is broken. so without replacing the bulb, current could not flow -- open circuit. all bulbs are dead.