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tiny-mole [99]
3 years ago
12

Which of the following does not use an internal combustion enginea. a cannonb. a lawnmowerc. a windmilld. a car

Physics
2 answers:
lara31 [8.8K]3 years ago
6 0
The windmill does not use a combustion engine.
damaskus [11]3 years ago
3 0

Answer:

c) a Windmill

Explanation:

A lawn mower may have a two stroke or a 4 stroke internal combustion engine.

Wind mill is a device that runs with wind. When wind blows, wings of the wind mill rotate. Wind mills are used to generate electricity. It is a renewable source of energy that requires large farms or open space for their establishment and maintenance.

In a cannon gun powder is ignited ,  not with the help of an engine , but a different method for its ignition.

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When a piano tuner strikes both the A on the piano and a 440 Hz tuning fork, he hears a beat every 2 seconds. The frequency of t
AysviL [449]

Answer:

The  frequency is  f = 439.5 \  Hz        

Explanation:

From the question we are told that

   The frequency of the  tuning fork is  f_t  =  440 \ Hz

   The beat period is  T  =  2 \  s

Generally the beat frequency is mathematically represented as

       f_b  =  \frac{1}{T}

       f_b  =  \frac{1}{2}

      f_b  = 0.5 \  Hz

The  beat frequency is also represented mathematically as

     f_b  =  f_t  -  f

Where  f is the frequency of the piano

 So

       f =  440 -  0.5  

       f = 439.5 \  Hz        

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