3 years ago

A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 6 s. What is

Physics

1 answer:

Ede4ka [16]3 years ago

3 0

Answer is B. 25 m/s

i took the same assignment earlier

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3 years ago

Driving your Ferrari through the Italian countryside at a speedy 88 m/s, you approach an opera diva singing a high C (1,046 Hz).

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You will hear the note E₆

Explanation:

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Your speed = 88m/s

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The Doppler effect says that:

$f' = \frac{v \pm v0 }{v \mp vs}*f$

Where:

f = original frequency

f' = new frequency

v = velocity of the sound wave

v0 = your velocity

vs = velocity of the source, in this case, the source is the diva, we assume that she does not move, so vs = 0.

Replacing the values that we know in the equation we have:

$f' = \frac{340 m/s + 88m/s}{340 m/s} *1,046 Hz = 1,316.73 Hz$

This frequency is close to the note E₆ (1,318.5 Hz)

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