Review for Physics 104 - 2nd Exam

Air Conditioners

  1. First Law - Energy conservation - DU= DQ -DW
  2. Entropy - Disorder - Cold systems are ordered.
    1. Organized systems (Chemical energy, gas in a small place)
  1. 2nd Law - Entropy always tends to increase (at best it stays the same)
    1. Entropy of one system can decrease, but the another system must increase at least as much.
    2. Examples -
    1. Hot water into cold - entropy of the hot decreases, but the entropy of the cold increases more
    2. Burning fuel
    3. Sliding object stopping due to friction (E is conserved, but not reversible)
  1. Heat pumps - air conditioners refrigerators
  1. Know the air conditioning cycle
  2. Know why it takes work to do it.
Automobiles
  1. Heat engines - take heat - convert it to work plus waste heat (why - 2nd law)
  2. The four stroke engine (Know it!)
  3. Other car parts -
    1. transmission
    2. spark plug
  1. Diesels
  2. Knocking
  3. Torque converter
Electric & Magnetic forces
  1. Electric charge
  2. Coulomb's law
  3. Voltage
  4. Electrostatic Precipitator
  5. Pauli exclusion principle
  6. Xerox Copiers (need to know physics - not the complete cycle)
    1. Photoconductors
    2. What the light does
    3. What the photoconducting belt does
  1. MagLev trains
    1. Magnets (two poles etc)
    2. Stable equilibrium
    3. Electromagnets - what causes themů
    4. Induction
    5. Lenz's Law of induction
    6. Superconducting magnets