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rewona [7]
3 years ago
8

What is a true statement about the rotation period of the moon?

Physics
1 answer:
mrs_skeptik [129]3 years ago
5 0
The time it takes for the Moon to rotate once around its axis is equal to the time it takes for the Moon to orbit once around Earth
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A particular engine has a power output of 8 kW and an efficiency of 37%. If the engine expels 10994 J of thermal energy in each
VARVARA [1.3K]

Answer:

(a) 17450.8 J (B) 1.239 sec

Explanation:

We have given power output =8 KW

Heat expelled = 10994 j

Efficiency =37% = 0.37

(A) We know that efficiency \eta =1-\frac{heat\ expelled}{heat\ input}

0.37=1-\frac{10994}{heat\ input}

Heat input =17450.8 J

(B) Work done by the engine is = 17450.8-10994=6456.8 j

Power output is given by 8 KW =8000 W

So time for each cycle is \frac{8000}{6456.8}=1.239 sec

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3 years ago
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astraxan [27]

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