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gayaneshka [121]
3 years ago
11

How do you reduce friction

Physics
1 answer:
choli [55]3 years ago
3 0
To reduce friction between two surfaces, you have to
make the surfaces smoother. 

The best way to do that is to introduce a fluid between them,
like grease, oil, or air.
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What affects sounds at their source? MENTION DOPPLER EFFECT AND VIBRATIONS
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Answer:

Doppler effect, the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by relative motion of the observer and the wave source. This phenomenon is used in astronomical measurements, in Mössbauer effect studies, and in radar and modern navigation.

Explanation:

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A force of 450 N moves a body through 300 cm in the direction of force. Calculate the work
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