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discussion_problems1

discussion_problems1 - DISCUSSION PROBLEM 1.1 answers...

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1 Origin of standardized units: LENGTH A “fallback” unit of length ... a bar of platinum- iridium with two scratches, exactly 1 meter apart. DISCUSSION PROBLEM 1.1 : Can you think of reasons why this may not be such a good standard today? DISCUSSION PROBLEM 1.1 : ... answers ... Variation of length with temperature? • Do you measure to the left-hand edge of the scratch, or the middle or the right-hand edge?
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2 DISCUSSION PROBLEM 1.2 : Can you think of any physical quantities that do not have dimension? DISCUSSION PROBLEM 1.2 : ... answers ... Ordinary numbers. π = = circumference diameter [ ] [ ] L L dimensionless. θ = = arc length radius [ ] [ ] L L dimensionless. Note that although θ has no dimension, it does have a unit (radians, degrees)! Specific gravity = weight of an object weight of an equal amount of water dimensionless.
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3 DISCUSSION PROBLEM 1.3 : Estimate how many quarts of milk (all kinds) are consumed each day at breakfast in the U.S. DISCUSSION PROBLEM 1.3 : ... answer ... Population 300,000,000
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