1. The problem statement, all variables and given/known data A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. 2. Relevant equations Linear Density = m/L 3. The attempt at a solution So far I've only found the linear density to be 0.0626kg/m. I'm stuck after this and have no clue on where to start next. 1. The problem statement, all variables and given/known data Earthquakes are essentially sound waves traveling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse seismic waves. These travel at different speeds. The speed of longitudinal waves, called P waves, is 8000m/s . Transverse waves, called S waves, travel at a slower 4500m/s . A seismograph records the two waves from a distant earthquake. 2. Relevant equations Not sure. 3. The attempt at a solution I'm not exactly sure on how to start this. This topic is very new to me. Can someone get me started?