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Section 2: Units, Scientific Notation, and SI Prefixes
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Content Videos Star Size: ideoId=HEheh1BH34Q Powers of 10: ideoId=qxXf7AJZ73A
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Quantities – Types of measurements
7 SI Base Units Length (m) Mass(not weight) (kg) Temperature (K) Time (s) Mole (mol) Luminosity (cd –candela) Electricity (amp – ampere) Derived Units Volume (m3) Speed (m/s) Flow Rate (kg/s) Area (m2) Force (N) Acceleration (m/s2) Momentum (kgm/s) Magnetic Flux (T/m2) And many many more!!!
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Vectors and Scalars Vectors: Quantities that have both a magnitude “how much” and direction. Examples: Forces Velocity Momentum Scalars: Quantities that only have a magnitude. Examples: Mass Time Energy
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Scientific Notation: Used to express very large or very small numbers.
How scientific notation is derived for larger numbers: 2 x 104m is the same as 20,000m Examples: 3.43x103
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How scientific notation is derived for small numbers: Example: 1
How scientific notation is derived for small numbers: Example: 1.99x10-4 means Examples: = 4.33x10-4 =
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Mixed Problems Write in Scientific Notation Write as regular number: .00932 33200 5.83x102 2.55x10-5
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SI Prefixes: Used to express Very large and Very small numbers Examples: 1000km = ________________m 30mg = __________________g 55 cm = __________________m 7.8 ns = __________________s
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Small Chart of Kilotons / Large Chart Megatons
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Tsar Bomb Video
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Zinc oxide balls used in solar panels used to scatter and trap light: 15nm across
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NASA's Hubble Space Telescope reveals the center of the magnificent barred spiral galaxy NGC 1512 in all wavelengths from ultraviolet to infrared. The colors (which indicate differences in light intensity) map where newly born star clusters exist in both 'dusty' and 'clean' regions of the galaxy. 1 YM across
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(Optional)Write the following without SI Prefixes
2 km 3 nm 5320 ms 2800 am 40 Mg 45 cm
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Accuracy vs. Precision Accuracy: How close a measurement is to the true value Precision: How close repeated measurements are to each other.
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What do you think of? Accuracy or Precision?
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What do you think of? Accuracy or Precision?
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