Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for...

Question:

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, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5 km/s The actual speeds vary depending on the type of material they are going through. The time delay between the arrival of these two waves at a seismic recording station tells geologists how far away the earthquake occurred. If the time delay is {eq}33~\mu s {/eq}, how far from the seismic station did the earthquake occur? Express your answer using two significant figures.

Distance, Speed:

{eq}\\ {/eq}

Distance is defined as the length of the path covered by an object. The rate at which an object covers distance is defined as the speed of the object.

The ratio of the distance covered by an object to the time length in which the distance was covered, is defined as the average speed of the object.

Answer and Explanation: 1

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{eq}\\ {/eq}

We are given:

  • The speed of the P-wave, {eq}v_p=6.5\;\rm km/s {/eq}
  • The speed of the S-wave, {eq}v_s=3.5\;\rm km/s {/eq}
  • The...

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Distance, Time & Average Speed: Practice Problems

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Chapter 1 / Lesson 3
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Distance is the measure in a straight line of how far something has traveled, and can be used to calculate speed when time is also known. Learn the equation used to calculate average speed through a set of practice problems.


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