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4 years ago

Why can light travel through outer space, but sound cannot?

2 answers:

6 0

because sound needs to travel through a medium , like air . much of outer space is a vacuum, with nothing there , so sound has nothing to travel through . Light does not need a medium to travel through .

I hope that's help !

WINSTONCH [101]4 years ago

5 0

Usually, sound needs a medium to travel through, like a vacuum for example.

Light does not need a medium to travel, and since air is considered a medium, light is not dependent on that.

On the other hand, sound needs a medium to travel through, and outer space doesn't contain space, therefore, no sound.

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The chart lists the masses and velocities of four objects.

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Which of the following are advantages of the SI system?

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A is the answer

Explanation:

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Answer:

v = 15.8 m/s

Explanation:

Let's analyze the situation a little, we have a compressed spring so it has an elastic energy that will become part kinetic energy and a potential part for the man to get out of the barrel, in addition there is a friction force that they perform work against the movement. So the variation of mechanical energy is equal to the work of the fictional force

$W_{fr}$ = ΔEm = $Em_{f}$ -Em₀

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Let's clear the speed

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4 years ago

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Two wheels roll side-by-side without sliding, at the same speed. The radius of wheel 2 is one-half (1/2) the radius of wheel 1.

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Answer:

w'=(1/2)w

Explanation:

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$\omega=\frac{v}{r}$ (1)

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r: radius of the wheel 1

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r'=2r

You replace this value of r' in the following equation:

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3 years ago

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klio [65]

The speed he was moving at when he finished falling is 30 m/s.

The given parameters;

mass of the bungee, m = 80 kg

impulse provided by the rope, J = 3200 Ns

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J = ΔP = Δmv = m(v - u)

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Thus, the speed he was moving at when he finished falling is 30 m/s.

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