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3 years ago

Some earthquake waves, a cat’s purr, and elephant communications consist of ultrasonic waves.

Physics

2 answers:

Kobotan [32]3 years ago

7 0

The answer to your question is true.

slavikrds [6]3 years ago

3 0

True because when a can purrs thats basically saying the cat is happy and cats, elaphants among other animals can sence eartquakes from miles away

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Shareen finds that when she drives her motorboat upstream she can travelwith a speed of only 8 m/s, while she moves with a speed

ANEK [815]

Let vb be the velocity of the motorboat and let vs be the velocity of the stream.

We know that when she drives upstream the velocity is 8 m/s, in this scenario the velocities point in opposite directions, then we have the equations:

$v_b-v_s=8$

When she drives downstream the velocites point in the same direction then we have the equation:

$v_b+v_s=12$

hence we have the system of equations:

$\begin{gathered} v_b-v_s=8 \\ v_b+v_s=12 \end{gathered}$

Solving the first equation for the velocity of the boat we have:

$v_b=8+v_s$

Plugging this in the second equation we have:

$\begin{gathered} 8+v_s+v_s=12 \\ 2v_s=4 \\ v_s=\frac{4}{2} \\ v_s=2 \end{gathered}$

Therefore, the velocity of the stream is 2 m/s

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1 year ago

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aivan3 [116]

That's the moon's perigee.

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3 years ago

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garik1379 [7]

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3 years ago

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vagabundo [1.1K]

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