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icang [17]
3 years ago
12

The wavelength of a wave is the horizontal distance from a ________ to an adjacent ________.

Physics
2 answers:
goldenfox [79]3 years ago
5 0
<span>A. crest, crest

hope im right!(: </span>
aleksandr82 [10.1K]3 years ago
5 0
D, It's both crest to crest and trough to trough.
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A train is moving in a straight railway where it covered one third of the distance with
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Answer:

<em>The average speed of the train is 45 km/h</em>

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<u>Speed</u>

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\displaystyle v=\frac{d}{t}

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\displaystyle t_1=\frac{d_1}{v_1}

\displaystyle t_1=\frac{1/3x}{25}

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Now the rest of the distance:

d2 = x - 1/3x = 2/3x

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\displaystyle t_2=\frac{d_2}{v_2}

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The total time is:

\displaystyle t_t=\frac{x}{75}+\frac{2x}{225}

\displaystyle t_t=\frac{3x}{225}+\frac{2x}{225}

\displaystyle t_t=\frac{5x}{225}

Simplifying:

\displaystyle t_t=\frac{x}{45}

The average speed is the total distance divided by the total time:

\displaystyle \bar v=\frac{x}{\frac{x}{45}}

Simplifying:

\boxed{\displaystyle \bar v=45\ km/h}

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