Find the amplitudes of high and low tides from mean sea level due to the moon by the equilibrium theory. Assume that \(M_{g} / M=81\) and \(R / a=60\). Compute the ratio of the solar tide to the lunar tide, given that \(M_{\text {aua }} / M_{E}=332,000\) and \(R_{\text {auz }} / a=23,200\).

Short Answer

Expert verified
Answer: The ratio of the solar tide to the lunar tide is approximately 0.456, meaning the solar tide is about 45.6% of the lunar tide.

Step by step solution

01

Find the amplitude of the lunar tide

Using the equilibrium tidal theory, the amplitude of the tide \(H\) due to the moon can be expressed as: \(H \propto \frac{M}{a^3}\) We are given the values of \(\frac{M_{g}}{M}=81\) and \(\frac{R}{a}=60\). We can rearrange these equations to find the values of \(M\) and \(a\) as follows: \(M = \frac{M_{g}}{81}\) and \(a = \frac{R}{60}\) Now, we can substitute these values of \(M\) and \(a\) into the equation for \(H\): \(H \propto \frac{M_{g}/81}{(R/60)^3}\) Simplify the equation: \(H \propto \frac{M_{g}}{R^3} \cdot \frac{1}{81} \cdot 60^3\) The amplitude of the lunar tide is: \(H = k \cdot \frac{M_{g}}{R^3} \cdot \frac{1}{81} \cdot 60^3\) where \(k\) is a proportionality constant.
02

Find the amplitude of the solar tide

Similarly, using the equilibrium tidal theory, the amplitude of the tide \(H_s\) due to the sun can be expressed as: \(H_s \propto \frac{M_{\text{aua}}}{R_{\text{auz}}^3}\) We are given the values of \(\frac{M_{\text{aua}}}{M_E}=332,000\) and \(\frac{R_{\text{auz}}}{a}=23,200\). We can rearrange these equations to find the values of \(M_{\text{aua}}\) and \(R_{\text{auz}}\) as follows: \(M_{\text{aua}} = 332,000 \cdot M_E\) and \(R_{\text{auz}} = 23,200 \cdot a\) Now, we can substitute these values of \(M_{\text{aua}}\) and \(R_{\text{auz}}\) into the equation for \(H_s\): \(H_s \propto \frac{332,000 \cdot M_E}{(23,200 \cdot a)^3}\) Using the previously found value of \(a\) from the lunar tide calculation, \(a = \frac{R}{60}\): \(H_s \propto \frac{332,000}{23,200^3} \cdot \frac{M_E}{R^3}\) The amplitude of the solar tide is: \(H_s = k' \cdot \frac{M_E}{R^3} \cdot \frac{332,000}{23,200^3}\) where \(k'\) is a proportionality constant.
03

Compute the ratio of the solar tide to the lunar tide

To find the ratio of the solar tide to the lunar tide, divide the amplitude of the solar tide \(H_s\) by the amplitude of the lunar tide \(H\): \(\frac{H_s}{H} = \frac{k' \cdot \frac{M_E}{R^3} \cdot \frac{332,000}{23,200^3}}{k \cdot \frac{M_{g}}{R^3} \cdot \frac{1}{81} \cdot 60^3}\) Simplify the equation by canceling out common terms and constants: \(\frac{H_s}{H} = \frac{\frac{M_E}{M_{g}} \cdot \frac{332,000}{23,200^3}}{\frac{1}{81} \cdot 60^3}\) We know that \(\frac{M_{g}}{M}=81\), so \(\frac{M_E}{M_{g}}=\frac{1}{81}\), and \(\frac{M_{\text{aua}}}{M_E}=332,000\). Substitute these values into the equation: \(\frac{H_s}{H} = \frac{\frac{1}{81} \cdot \frac{332,000}{23,200^3}}{\frac{1}{81} \cdot 60^3}\) Simplify the equation further: \(\frac{H_s}{H} = \frac{332,000}{60^3 \cdot 23,200^3}\) The ratio of the solar tide to the lunar tide is: \(\frac{H_s}{H} \approx 0.456\) Hence, the solar tide is approximately 45.6% of the lunar tide.

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