Which situation best describes the act of reducing? paying bills online instead of sending paper through the mail donating gentl
2 answers:
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For this case we have that by definition, physical power refers to the amount of work done for a unit of time.
So:
Where:
W: It's the work
t: It's time
The power units are in
So, according to the problem data we have:
Clearing the work of the formula:
Thus, the work is 1200 joules.
Answer:
Option C
The reason for that is that P-waves (primary waves) travel faster than S-waves (secondary waves).
If we call
the speed of the primary waves and 
the speed of the secondary waves, and we call 
the distance of the seismogram from the epicenter, we can write the time the two waves take to reach the seismogram as
So the lag time between the arrival of the P-waves and of the S-waves is
We see that this lag time is proportional to the distance S, therefore the larger the distance, the greater the lag time.
If we call
So the lag time between the arrival of the P-waves and of the S-waves is
We see that this lag time is proportional to the distance S, therefore the larger the distance, the greater the lag time.