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CHAPTER OUTLINE
1.1
Standards of Length, Mass,
and Time
1.2
Matter and ModelBuilding
1.3
Density and Atomic Mass
1.4
Dimensional Analysis
1.5
Conversion of Units
1.6
Estimates and Orderof
Magnitude Calculations
1.7
Significant Figures
Physics and Measurement
ANSWERS TO QUESTIONS
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
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .
 Fall '11
 Staff
 Physics, Mass

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