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Warm up 4/29/13

Warm up 4/29/13. Question: What is the efficiency of a car that turns 13 J out of 100 J into useful motion? Answer: Eff = Wo / Wi 13 J/100 J = 13% Goal: I will measure efficiency. Element of the day. 70 – Ytterbium – Yb

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Warm up 4/29/13

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  1. Warm up 4/29/13 • Question: What is the efficiency of a car that turns 13 J out of 100 J into useful motion? • Answer: • Eff = Wo / Wi • 13 J/100 J = 13% • Goal: I will measure efficiency.

  2. Element of the day • 70 – Ytterbium – Yb • Ytterbium (70), yttrium (39), terbium (67) and erbium (68) are all named after Ytterby, a town in Sweden where they were discovered in a mine. • Ytterbium is used in lasers. Lasers align light so that every single photon is the exact same wavelength in a completely coherent beam of light.

  3. Quiz Corrections • Lab 7C • Review Efficiency Problems • Tonight’s HW • Ch 8 Quiz Friday • Portal survey • Lab 7C (all) • Quiz Corrections Agenda / HW

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