hey840

21.09.2020 • 

Mathematics

There are a number of seismic recordings from earthquakes and from mining explosions in astsa. All of the data are in the dataframe eqexp, but two specific recordings are in EQ5 and EXP6, the fifth earthquake and the sixth explosion, respec- tively. The data represent two phases or arrivals along the surface, denoted by P (t = 1,...,1024) and S (t = 1025, ..., 2048), at a seismic recording station. The recording instruments are in Scandinavia and monitor a Russian nuclear testing site. The general problem of interest is in distinguishing between these waveforms in order to maintain a comprehensive nuclear test ban treaty. To compare the earthquake and explosion signals, (a) Plot the two series separately in a multifigure plot with two rows and one column.
(b) Plot the two series on the same graph using different colors or different line types.
(c) In what way are the earthquake and explosion series different?

Ответ:

devinblitz4363

03.06.2023

Mathematics

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Two angles are said to be coterminal if they locate the same point on the circumference.

This means that two angles are coterminal if they differ by a multiple of 360°: if you make a certain numbers of whole turns, in either direction, you end up in the same point.

So, you solve problems like this by adding or subtracting 360, until you are inside the interval [0,360].

In this case, you only need to add 360 once:

So, -315° and 45° are two coterminal angles.

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