Lecture 02 - Gautam Dagur Chemistry 132 Spring 2010 Lecture...

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Gautam Dagur Chemistry 132 Spring 2010 Lecture 02: Energy, Work, and Heat (textbook 6.1 – 6.3) 1. Units of energy a. Joule i. 1 J = 1 kg m 2 /s 2 ii. KE = ½ mv 2 so 1 kg object moving at a velocity of 1 m/s has 1 J of KE b. calorie i. 1 cal is the amount of energy needed to raise the temperature of a gram of water by 1 o C ii. 1 cal = 4.184 J c. Calorie i. 1 Cal = 1000 cal = 1 kcal ii. Used to measure energy in food iii. 1 Cal = 4.184 kJ 2. Electrical Units a. Electrical potential – volts (V) b. Electrical charge – coulombs (C) c. V x C = Electrical potential energy = 1J d. Electrical power = energy supplied/ second i. 1 J/s = 1 W (watt) 3. What is work a. Work is done when a force moves an object b. Work = force applied x distance moved c. Work transfers energy to an object
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Gautam Dagur Chemistry 132 Spring 2010 d. A definition: Work is the energy that is transferred when a force moves an object. The work is calculated by multiplying the force times the distance the object moved. 4.
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Lecture 02 - Gautam Dagur Chemistry 132 Spring 2010 Lecture...

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