Chapter01

# Chapter01 - Chapter 1 Units, Physical Quantities, and...

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Chapter 1 Units, Physical Quantities, and Vectors

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3. Standards and Units ± SI ( Système International (french)) unit (or MKS unit) Time in s (second) Length in m (meter) Mass in kg ± An equation must be dimensionally consistent (be sure you’re “adding apples to apples”). ± “Have no naked numbers” (always use units in calculations).
4. Uncertainty and Significant Figures ± Significant figures : all the digits that are known accurately + one estimated digit

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± Rules ² Nonzero digits are always significant. ² Final or ending zeros to the right of the decimal point are significant. ² Zeros written to the right of the decimal point for the purpose of spacing the decimal point are not significant. ² Zeros written between significant figures are significant. ± Examples ² 409.9 s ( ), 0.058700 cm ( ), 9500 g ( ), 950.0 × 10 1 mL ( ) ² 0.0001054 kg ( ), 0.005800 cm ( ), 602000 s ( ) ± When ambiguous, use the scientific notation.
7. Vectors and vector addition ± Vector quantity has a magnitude and a direction : ± negative of a vector : same magnitude, opposite direction ± means they are antiparallel.

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## This note was uploaded on 02/13/2012 for the course RANDOM 100 taught by Professor Idk during the Fall '08 term at Virginia Tech.

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Chapter01 - Chapter 1 Units, Physical Quantities, and...

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