Make a reasonable estimate of the average amplitude and wiavelength of typical waves on the ocean and compute the power they carry. Express the result in horsepower per mile of wavefront.

Short Answer

Expert verified
Answer: The estimated power carried by typical ocean waves is approximately 118874 horsepower per mile of wavefront.

Step by step solution

01

Estimate the average amplitude and wavelength of ocean waves

We will make some rough assumptions about the average amplitude and wavelength of ocean waves. Let's assume the average amplitude (height) of an ocean wave is 2 meters and the average wavelength is 100 meters. These values can vary greatly depending on various factors such as wind, location, and weather conditions.
02

Calculate the energy of one wave

To calculate the energy carried by one wave, we can use the formula for the energy of a wave: Energy (E) = (1/2) × (mass density of water) × (wave amplitude)^2 × (wave speed)^2 × (wavelength) Mass density of water is approximately 1000 kg/m³, and we can estimate the wave speed (v) using the deep-water wave speed formula: v = sqrt((gravitational acceleration × wavelength) / (2 × pi)) With gravitational acceleration (g) as 9.81 m/s² and wavelength (λ) as 100 meters, we can calculate the wave speed: v = sqrt((9.81 × 100) / (2 × pi)) ≈ 14.04 m/s Now, we can find the energy of one wave: E = (1/2) × 1000 × (2)^2 × (14.04)^2 × 100 ≈ 3.93 × 10^7 J (Joules)
03

Convert energy to power and units

As power is defined as energy per unit time, we need to find out the time it takes for one wavelength to pass a certain point. This can be calculated by dividing the wavelength by the wave speed: Time (T) = Wavelength / Wave speed = 100 / 14.04 ≈ 7.12 s Now, we will find the power (P) by dividing energy by time: P = E / T = 3.93 × 10^7 J / 7.12 s ≈ 5.52 × 10^6 W (Watts) To express the power in horsepower (hp), we will convert watts to horsepower using the conversion factor 1 hp = 746 W: Power (hp) = 5.52 × 10^6 W / 746 ≈ 7400 hp Finally, we need to express the result in horsepower per mile of wavefront. Since we assumed a wavelength of 100 meters, we have: 1 mile ≈ 1609.34 meters Number of wavelengths per mile = 1609.34 / 100 ≈ 16.09 Power per mile of wavefront = 7400 hp × 16.09 ≈ 118874 hp per mile
04

Final answer

The power carried by typical ocean waves is approximately 118874 horsepower per mile of wavefront. Please note that this is a rough estimate and can vary depending on the actual amplitude, wavelength, and wave speed.

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