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3 years ago

10

What would happen to the amount of matter on earth if mass were not conserved during changes of state?

2 answers:

Paladinen [302]3 years ago

5 0

It would be very bad earth wouldve felled

attashe74 [19]3 years ago

4 0

<span>earth would be thrown off its balance and nature would be in danger of too many resources and not enough resources </span>

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A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may n

uranmaximum [27]

The Doppler effect is the right concept to solve this problem. The Doppler effect is understood as the change in apparent frequency of a wave produced by the relative movement of the source with respect to its observer. Mathematically it can be described as,

$f = (1-\frac{v_0}{v})f_0$

Here,

$f_0$ = Frequency of the sound from the Whistle

f = Frequency of sound heard

v = Speed of the sound in the Air

Replacing we have that

$1- \frac{v_0}{343} = \frac{20kHz}{21kHz}$

$\frac{v_0}{343} = 1-\frac{20}{21}$

$\frac{v_0}{343} = \frac{1}{21}$

$v_0 = \frac{1}{21}(343)$

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Therefore the minimum speed to know if the whistle is working is 16.33m/s

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3 years ago