# Determine how many vibrations on a sea wave an inflatable rubber boat will make in 20 s

June 28, 2021 | education

| **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.

N -?

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.