Earthquake Analysis. Earthquakes produce several types of shock waves. The most well known are the P-waves (P for primary or pressure ) and the S-waves (S for secondary or shear ). In the earth’s crust, P-waves travel at about 6.5 km/s and S-waves move at about 3.5 km/s. The time delay between the arrival of these two waves at a seismic recording station tells geologists how far away an earthquake occurred. If the time delay is 33 s, how far from the seismic station did the earthquake occur?
Earthquake Analysis. Earthquakes produce several types of shock waves. The most well known are the P-waves (P for primary or pressure ) and the S-waves (S for secondary or shear ). In the earth’s crust, P-waves travel at about 6.5 km/s and S-waves move at about 3.5 km/s. The time delay between the arrival of these two waves at a seismic recording station tells geologists how far away an earthquake occurred. If the time delay is 33 s, how far from the seismic station did the earthquake occur?
Earthquake Analysis. Earthquakes produce several types of shock waves. The most well known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth’s crust, P-waves travel at about 6.5 km/s and S-waves move at about 3.5 km/s. The time delay between the arrival of these two waves at a seismic recording station tells geologists how far away an earthquake occurred. If the time delay is 33 s, how far from the seismic station did the earthquake occur?
On December 26, 2004, a great earthquake occurred off the coast of Sumatra and trig-
gered immense waves (tsunami) that killed some 200, 000 people. Satellites observing
these waves from space measured 800 km from one wave crest to the next and a period
between waves of 1.0 hour. What was the speed of these waves in m/s and km/h?
Does your answer help you understand why the waves caused such devastation?
You place your ear onto a steel railroad track and hear the sound of a distant train through the rails Δt = 3.3 seconds faster than you do through the air. The speed of sound in steel is vs = 6100 m/s while in air the speed of sound is va = 343 m/s.
Write an equation for the time it takes the sound to reach you through the air if the distance to the train is represented by D.
Write an equation for the time it takes the sound to reach you through the steel if the distance to the train is represented by D.
Use the difference in these two times to write an equation for the distance to the train.
For the given information find the distance to the train in meters
Picnickers see a lightning flash and hear the resulting thunder 5 seconds later. The storm is traveling at a rate of 21 km/hr.Use 344 m/s for the speed of sound.(a) Roughly how far away is the storm in miles?Don't use this number for parts (b) thru (e)(b) How far away is the storm (hint: use 344 m/s...)?(c) How fast is the storm in m/s?(d) How long do the picnickers have before the storm arrives (sec)?(e) How long do the picnickers have before the storm arrives (min)?
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