University of California, San Diego
Physics 1b - Thermodynamics, Electricity & Magnetism

H. E. Smith   Spring 2000

Physics 1B - Tutorial #1

  1. What temperature has the same numerical value in Celsius (Centigrade) and Fahrenheit? Is there a temperature which has the same value on the Celsius and Kelvin (thermodynamic) scales?
    TC = TF at -40°

  2. A circular iron plate has a coefficient of linear expansion of 10-5K-1. At 20°C it has a central circular hole of radius 2 inches. The plate is then heated to 40°C.

  3. The surface area of the earth is approximately 5 x 1014m2. The scale height (thickness) of the earth's atmosphere is 104m. A cubic meter of air at room temperature and a pressure, P = 1 atmosphere, has a mass of 1.3kg.
  4. You use superglue to attach a strip of copper to a strip of aluminum at 20C. Coefficients of linear expansion: Cu = 16.6 x 10-6K-1; Al = 25 x 10-6K-1.
  5. As you learned in Physics 1A, rocket propulsion employs the principle of Conservation of Linear Momentum. Ideally, the burning (oxidation) of hydrocarbon fuels produces water (H2O) and carbon dioxide (CO2) which are expelled at high velocity. Sketch a diagram of how the burning of rocket fuel propels a rocket forward.

  6. The next time you are home, take apart your thermostat and demonstrate to your parents how a bi-metallic strip works. Four brownie points if you can reassemble the thermostat and your home heating system still works,

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Gene Smith

Last modified: Tues., 4 April 2000