Problem 22
Infer In some areas tidal energy is used as an alternative energy source. What are some advantages and disadvantages of doing this?
Problem 23
Invention Design a method for desalinating water that does not use solar energy. Draw it, and display it for your class.
Problem 25
Wave Speed Wave speed of deep water waves is calculated using the formula \(S=L / T\), where \(S\) represents wave speed, \(L\) represents the wavelength, and \(T\) represents the period of the wave. What is the speed of a wave if \(L=100 \mathrm{~m}\) and \(T=11 \mathrm{~s}\) ?
Problem 26
Wave Steepness The steepness of a wave is represented by the formula Steepness \(=H / L\), where \(H=\) wave height and \(L=\) wavelength. When the steepness of a wave reaches \(1 / 7\), the wave becomes unstable and breaks. If \(L=50 \mathrm{~m}\), at what height will the wave break?
