Basic Units Lengthmeters Masskilograms Timeseconds.

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Presentation transcript:

Basic Units Lengthmeters Masskilograms Timeseconds

TemperatureKelvin Amount Chm Mole CurrentAmpere Luminous InCandela

Metric Prefixes Mega(M)Nano(n) Kilo(k) Milli(m)Centi(c) Micro(  )

Metric Prefixes (M) = 10 6 (n) = (k) = 10 3 (m) = (c) = (  ) = 10 -6

Accuracy How close you are to the real answer

Precision How well one can repeat his or her work Repeatability

Uncertainty All measurements have a degree of unreliability Usually in the last digit of a measurement

Significant Digits Meaningful digits in a number

Multiplication Uncertainty The answer should have the same number of significant digits as the multiplier with the least number of SD Same for division

Addition Uncertainty When adding, line up decimal place & add The decimal places in the answer should = the least Same for subtraction

Determining Significance All non-zero digits All zeros between non-zero numbers All trailing zeros if there is a decimal place

Scientific Notation M x 10 n M = 1.00  M < n = an integer

Conversion Factor Ratio equal to one 12 inches/1 foot Multiply one unit by a conversion to obtain another unit w/o affecting magnitude

Convert: 2.50 cm to Mm 4.2 ns to ms 3.15 kg to  g

Determine the length in miles of a light year Light year = distance light travels in one year c = 3.0 x 10 8 m/s 1 mile = 5280 ft 1 inch = 2.54 cm

Convert: 4.35 kg/L to mg/  L 2.31 mm/ns to cm/Ms

Calculate the volume in m 3 occupied by 750 kg of gas with 1.50 g/L 1 cm 3 = 1 mL

Calculate the mass in kg of a board that has dimensions of 250 mm x 4.0 x 10 4  m x 2.5 m and had a density of 0.80 g/mL 1 ml = 1 cm 3

Calculate the density of a 3.14 x 10 3 kg cylinder that 5.0 m long & has a diameter of 2.0 m.

How many nm will an object travel in 1/132 ks at 720 miles per hour 1 inch = 2.54 cm 1 mile = 5280 ft

Measurements Work problems on page 25

Sig. Figs. Work problems on page 25

Conv. Factors Work problems 28 & 36 on page 24

Measurements Work problems on page 25

Define all the key terms on page 24

Work problems on page 25

Conversion Factors Work problems on page 25