# Waves questions

1. Feb 8, 2005

### furtivefelon

hi everyone :D i have two questions i have no idea what to do (teacher assigned them after watching a video, though i have no idea still what the video is talking about)..

the questions is:

1. Would gravity waves in water be faster or slower on the moon? Explain.
i would think that it's slower on the moon, because there is less gravitational pull on the moon, thus the wave would be slower.

2. How would you find out if the moon had a liquid center? Explain.
i would explode a bomb very near hte surface, and set up detecting stations all along the moon surface, and then detect for hte presence of sheer waves, since sheer waves passes through rock and doesn't pass liquid, i would be able to tell if the moon center is liquid or not..

just wondering if my answers is adquate, and also, where would you find a engineering calculator? the teacher also gave us a hypobolic question (which i have no idea what is tanh, he said that it's found on most engineering calculators..)

thanks alot for all your help :D

2. Feb 8, 2005

### dextercioby

The first question really doesn't make 2 much sense...

As for
$$\tanh x=:\frac{\sinh x}{\cosh x}=\frac{e^{x}-e^{-x}}{e^{x}+e^{-x}}=\frac{e^{2x}-1}{e^{2x}+1}$$

Daniel.