Material Covered on Exam 3

Exam 3 will be held Friday, Nov. 15 during the normal lecture period. The exam will consist of a combination of multiple choice questions similar to the assigned homework. There are only a few equations, so you need to remember them.

Notes are not allowed but calculators are allowed. Makeup exams will not be given, but an alternative assignment may be given instead in the event of a previously approved excuse or an approved emergency.


Chapter 5

Concepts:

Viscous flow, Poiseuille's Law, aerodynamic forces, Bernouli's equation in aerodynamics, laminar and turbulent flow, Reynolds number, lift and drag, boundary layers, baseballs, golf balls, frisbees, airplane and rocket engines, universal gravitation.

Equations:

Poisuille's Law: volume flow rate = (pi x pressure difference x pipe diameter4) / (128 x pipe length x viscosity)

Reynold's Number: R = density x obstacle length x flow speed / viscosity. R> 2300 (roughly) corresponds to turbulent flow.


Chapter 6

Concepts:

Heat and temperature, thermal energy, internal energy, burning, convection, conduction, radiation, light bulbs, Stefan-Boltzmann relation, entropy, refrigerators and air conditioners, the three laws of thermodynamics. The section on heat engines will be covered after the exam, and not included in it.

Equations:

Stefan-Boltzmann equation: radiated power = emissivity x Stefan-Boltzmann constant x (absolute temperature)4 x surface area.

Stefan-Boltzmann constant = 5.67 x 10-8 W/(m2 K4)

Zeroth Law of Thermodynamics: Two objects in thermal equilibrium with a third object are in thermal equilibrium with each other.

First Law of Thermodynamics: The change in an object's energy is equal to the heat put into it minus the work done.

Second Law of Thermodynamics: The entropy of an isolated system never decreases.

Third Law of Thermodynamics: The entropy of an object approaches 0 as the temperature approaches absolute zero.

Units:

The SI unit of Temperature is the degree Kelvin or degree Celsius. Water freezes at 0C and boils at 100C. T(Kelvin) = T(Celsius) + 273 K. Absolute zero is 0 K = -273 C.


Physics 101 Department of Physics University of Tennessee