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Oxana [17]
3 years ago
5

The time needed for a water wave to change from the equilibrium level to the crest is 0.1475 s. What fraction of a wavelength is

this?
Physics
1 answer:
dmitriy555 [2]3 years ago
3 0

Answer:

one-fourth of the wavelength

Explanation:

When any wave move form its equilibrium to level to the crest then it covers one-fourth of the wavelength. The waves goes twice to its extreme position, once at the crest and one at the trough.

The midway between the crest and trough is the equilibrium position of the wave. The wave in one cycle covers 360° phase. Here when the wave goes from equilibrium to the crest then the wave covers 90° of the phase.

The given time multiplied by 4 gives the time period of the wave.

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Answer:

P₁ = 219.3 Pa

Explanation:

This fluid mechanics problem, we can use that the pressure is distributed with the same value throughout the system, which is Pascal's principle.

Let's use the subinidce1 for the small diameter and the subscript 2 for the larger diameter.

              P₁ = P₂

pressure is defined by

             P = F / A

we subtitute

             F₁ / A₁ = F₂ / A₂

             F₁ = F₂ A₁ / A₂

the area in a circle is

             A = π r² = π d² / 4

we substitute

            F₁ = F₂ (d₁ / d₂)²

we calculate

           F₁ = 17640 (2/32)²

           F₁ = 68.9 N

Having the force to be applied we can find the air pressure on the small plunger

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let's calculate

          P₁ = 68.9 4 / (π 0.02²)

          P₁ = 219.3 Pa

3 0
3 years ago
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