Writing And Evaluating Scientific Notation Worksheet Page 5
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1520. Arrange these numbers in order from smallest to largest, writing them in standard
form.
-5
a.
3.9 x 10
4
b.
2.18 10
1
c.
5 x 10
-2
d.
1.032 x 10
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21. The lightest of all atoms, hydrogen, has a diameter of 1 x 10
cm and weighs 1.7 x
-24
10
grams. Write these measurements as ordinary numbers.
22. A computer works with numbers in normalized floating point form . An example is
4
. Write this number in both scientific notation and standard form.
0.46730218 x 10
Star Travel
Solve. Write your answer in scientific notation unless otherwise directed. Use the
information in early problems to help find later solutions…
23. An unmanned spacecraft sets out to explore the moon, Jupiter, and Alpha Centauri,
the closest star in our galaxy. A typical rocket travels about 20,000 mi/h. Write
this number in scientific notation.
24. The trip to the moon will take about 12 h. Use your answer to Exercise 23 and the
formula d = rt to find the distance to the moon in scientific notation.
25. The trip from the moon to Jupiter will take about 24,000 h.
a.
Write the number of hours in scientific notation.
b.
Find the distance from the moon to Jupiter.
c.
Write the number of days the journey will take in standard form.
(1day = 24h).
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26. From Earth, the trip to Alpha Centauri will take about 1.25 x 10
h. Find the
distance to Alpha Centauri.
4
27. The most distant star in the Milky Way in about 2.5 x 10
times as far from Earth
as Alpha Centauri. Find the distance to this star.
28. Name at least three real-life quantities which are conveniently written in scientific
notation.
29. Ten 100-watt light bulbs use 1 kilowatt of electricity per hour. If electricity cost
8.4 cents per kilowatt, how much does it cost when a 40-watt, a 75-watt, and a 100-
watt bulb are on for 8 hours?
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