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Chapter 3
Manual Calculations
1. Try it!
The speed of light is known to be 186,282 miles
(approximately 300,000 kilometers) per second.
That means light can go around the earth 7 and
a half times within a second!
Suppose you are standing at the equator. While
the earth rotates over the period of one day, you
also rotate around the globe at a certain speed.
Knowing the facts above, can you figure out
how fast you are traveling, in miles per hour?
Since distance traveled = average speed × time taken, the following
equation can be formed to find out the circumference of the earth (x
miles):
Then,
Since you know the earth turns around once a day (which means,
in 24 hours), divide the above "x" with 24 to get a value in miles per
hour.
x × 7.5 = 186282
x = 186282 ÷ 7.5
24 × v = x
v = x
24
49
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