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katrin2010 [14]
3 years ago
14

A turnip is dropped from a height of 70 meters. How long does it take to hit the ground?

Physics
1 answer:
Bess [88]3 years ago
3 0

Here's a formula for the distance an object falls from rest:

D = (1/2) A T² ... <== MEMORIZE THIS

Distance = (1/2) · (acceleration) · (time²)

On Earth, the acceleration of gravity is always 9.8 m/s².  So for a fall that starts with zero speed, the formula says

70 m = (1/2) (9.8 m/s²) (time²)

70 m = (4.9 m/s²) (time²)

Divide each side by  (4.9 m/s²) ;

time² = (70 m) / (4.9 m/s²)

time² = (70/4.9) sec²

time = √(70/4.9)  seconds

time = 3.78 seconds

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(1.b) The intensity of the sound wave as it reaches the person listening is 0.02 W/m².

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The surface area being vibrated by the time the sound reaches the listener is calculated as follows;

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<h3>Intensity of the sound</h3>

The intensity of the sound is calculated as follows;

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<h3>Frequency of the sound</h3>

The frequency of the sound heard is determined by applying Doppler effect.

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  • fs is the source frequency
  • fo is the observed frequency
  • v is speed of sound

f_0 = f_s(\frac{v-v_0}{v- v_s} )

f_0 = 512(\frac{340.3 - 10}{340.3 - 65} )\\\\f_0 = 614.3 \ Hz

Learn more about intensity of sound here: brainly.com/question/17062836

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