# Earthquakes produce several types of shock waves. The best known are the P-waves (P for primary...

## Question:

Earthquakes produce several types of shock waves. The best 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 around6.40 km/s while S-waves move at about 3.50 km/s. (The actual speeds vary with the type of material the waves are going through.) The time delay between the arrival of these two types of waves at a seismic recording station tells geologists how far away the earthquake that produced the waves occurred. If the time delay at a seismic station is 38.0 s, how far from that station did the earthquake occur?

One form of earthquake warning system detects the faster (but less damaging) P-waves and sounds an alarm when they first arrive, giving people a short time to seek cover before the more dangerous-waves arrive. If an earthquake occurs 373 km away from such a warning device, how much time would people have to take cover between the alarm and the arrival of the S-waves?

## Linear velocity

Linear velocity is defined as the amount of displacement per unit time that a body has. Velocity is a vector that varies in direction and magnitude. Mathematically it is represented as follows,

{eq}\vec{v} = \dfrac{\vec{x}}{t} {/eq}

Here,

{eq}\rm \vec{x} = \text{Displacement}\\ t = \text{Time} {/eq}

## Answer and Explanation: 1

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View this answerPART A) We need to formulate a system of equations with the given information. Velocity is defined as

{eq}\rm v = \dfrac{x}{t} {/eq}

Here,

{eq}\r...

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