Earthquakes generate sound waves inside earth. unlike a gas, earth can experience both transverse (s) and longitudinal (p) sound waves. typically, the speed of s waves is about 4.88 km/s, and that of p waves 7.94 km/s. a seismograph records p and s waves from an earthquake. the first p waves arrive 1.83 min before the first s waves. if the waves travel in a straight line, how far away does the earthquake occur?

The earthquake is 1390.4014 km far away.

Explanation:

Given:

Speed of transverse (S) waves, v₁ = 4.88 km/s  

Speed of longitudinal(P) waves, v₂ = 7.94 km/s  

Time difference between the P waves and the S waves, Δt = 1.83 min  

Also, 1 minute = 60 seconds

So,  

Δt = 1.83 min = 1.83×60 seconds = 109.8 seconds

Let the earthquake is d km far from the seismograph. So,

Distance = d  

Time taken by transverse (S) waves:

t₁ = d / v₁ = d / 4.88 seconds

Time taken by longitudinal(P) waves, v₂:

t₂ = d / v₂ = d / 7.94 seconds

Time difference,  Δt = t₁ - t₂ = (d / 4.88) - (d / 7.94)

109.8 = d (1/4.88 - 1/7.94)

109.8 = d (0.07897)

Solving for d,

d = 109.8 / 0.07897 = 1390.4014 km

Thus, The earthquake is 1390.4014 km far away.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

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