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(CHM_230) Physics For Scientists And Engineers

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Solution Manual Physics For Scientists And Engineers 6E By Serway And Jewett

University

Πανεπιστήμιο Πατρών

Physics and Measurement

Q1.1 Atomic clocks are based on electromagnetic waves which atoms
emit. Also, pulsars are highly regular astronomical clocks.
Q1.2 Density varies with temperature and pressure. It would be
necessary to measure both mass and volume very accurately in
order to use the density of water as a standard.
Q1.3 People have different size hands. Defining the unit precisely
would be cumbersome.
Q1.4 (a) 0.3 millimeters (b) 50 microseconds (c) 7.2 kilograms
Q1.5 (b) and (d). You cannot add or subtract quantities of different
dimension.
Q1.6 A dimensionally correct equation need not be true. Example:
1 chimpanzee = 2 chimpanzee is dimensionally correct. If an
equation is not dimensionally correct, it cannot be correct.
Q1.7 If I were a runner, I might walk or run 101 miles per day. Since I am a college professor, I walk about
100 miles per day. I drive about 40 miles per day on workdays and up to 200 miles per day on
vacation.
Q1.8 On February 7, 2001, I am 55 years and 39 days old.
55
365 25
1
39 20 128
86 400
1
1 74 10 10 9 9 yr
d
yr
d d
s
d
s s
.
. ~
FH G
IK J
+ = FH G
IK J
= × .
Many college students are just approaching 1 Gs.
Q1.9 Zero digits. An order-of-magnitude calculation is accurate only within a factor of 10.
Q1.10 The mass of the forty-six chapter textbook is on the order of 100 kg .
Q1.11 With one datum known to one significant digit, we have 80 million yr + 24 yr = 80 million yr.

SOLUTIONS TO PROBLEMS
Section 1.1 Standards of Length, Mass, and Time
No problems in this section
Section 1.2 Matter and Model-Building

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(CHM_230) Physics For Scientists And Engineers

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