Determine how many vibrations on a sea wave an inflatable rubber boat will make in 20 s, if the wave propagation speed is 4 m / s, and its length is 4 m.
t = 20 s.
V = 4 m / s.
λ = 4 m.
The number of vibrations of the boat N on sea waves is expressed from the formula for determining the frequency of vibrations: v = N / t, where v is the frequency of vibrations, N is the number of vibrations during time t.
N = v * t.
We express the frequency of sea waves v by the formula: v = V / λ, where V is the wave propagation speed, λ is the wavelength.
The number of oscillations N of the boat on the waves will be determined by the formula: N = V * t / λ.
N = 4 m / s * 20 s / 4 m = 20.
Answer: the boat will make N = 20 vibrations on the waves.
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