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yulyashka [42]
3 years ago
15

In the mirror diagram shown, which is the normal? А В С D

Physics
1 answer:
Serga [27]3 years ago
4 0

Answer:

C

Explanation:

The normal is the line which divides the angle between the incident ray (which is the ray of an object which strikes the mirror) and the reflected ray(the ray which is thrown back as the object hits the mirror surface) into two equal parts. The normal is always perpendicular to the surface. In the description agram Given , the Noa which is the line C, divides the reflected ray (line D) and the incident ray (line A) into two equal parts. The plane surface is line B and the other incident ray (line C) is perpendicular to B

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If a 0.75 efficient motor produces 150 W of useful power, what was the input power? *
vlada-n [284]

Answer:

<em>The input power is 200 W</em>

Explanation:

<u>Motor Efficiency</u>

The efficiency of a motor can be calculated as follows:

\displaystyle \beta=\frac{P_o}{P_i}

Where:

β   = efficiency

Po = Output power

Pi  = Input power

Solving for Pi:

\displaystyle P_i=\frac{P_o}{\beta}

The efficiency is β=0.75 and the output power is Po=150 W, thus the input power is:

\displaystyle P_i=\frac{150}{0.75}

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Have a good day! :D

Explanation:

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