3 years ago

I’m just completely confused

Physics

1 answer:

Neporo4naja [7]3 years ago

6 0

4. It is substances

I don't know the 3rd one

Hope it helped you

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A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with

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$f'=(\frac{330 m/s}{330 m/s-33.0 m/s})(41.2 kHz)=45.8 kHz$

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3 years ago