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alexdok [17]
2 years ago
7

Electromagnetic waves travel through space at a speed of _____.

Physics
2 answers:
Veseljchak [2.6K]2 years ago
6 0
The answer is C 300,000 kilometers per second

pogonyaev2 years ago
5 0

Ans: C) 300,000 kilometers per second

Electromagnetic waves are created by the movement of charges. This results in the generation of electric and magnetic fields which oscillate in a direction perpendicular to each other.

Electromagnetic waves carry a certain wavelength, frequency and speed. The speed of such waves as they travel through space is equal to the speed of light (c) = 3*10⁸ m/s

since 1 km = 10³ m

speed, c = 1 km * 3*10⁸ ms-1/10³ m

                = 300, 000 km/s

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Answer:

η = 58.8%

Explanation:

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W =F*d

where:

W = work [J] (units of joules)

F = force = 294 [N]

d = distance = 5 [m]

W = 294*5\\W = 1470 [J]\\

Efficiency is defined as the energy required to perform an activity in relation to the energy actually added to perform some activity. This can be better understood by means of the following equation.

efficiency = W_{done}/W_{required}\\efficiency = 1470/2500\\efficiency = 0.588 = 58.8%

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3 years ago
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Explanation:

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2.7 * 10⁵ W = Energy / (1/675)

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Therefore the energy emitted as light is 400J.

Since the conversion of electric energy to light is 95% efficient, hence the energy stored as electrical energy is:

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denis23 [38]
<span> The box is exerting a force of its weight. So we'll use W=mg (Note: you can use the notation F=ma, doesn't matter since weight IS a force.) We can call g negative since it's directed down towards the earth. 
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