The Art of Estimation Physics

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Presentation transcript:

The Art of Estimation Physics also known as Ph 2239 Statistical Mechanics for Dummies Patrick Diamond, George M. Fuller, Tom Murphy Department of Physics, University of California, San Diego

Handy Facts: Solar System radius of earth’s orbit around sun

Handy Facts: the Universe

Fluids, Transport, Turbulence

Mean Free Path/Time diffusion constant

Random Walk time to random walk a distance R

Fluid Dynamics – for the impatient Really, nothing more than energy-momentum conservation

Kinematic Viscosity

Perfect Fluid: No viscosity and no heat flow in a momentarily co-moving rest frame

Example: photon viscosity (radiation dominated)

Reynolds number

“The Feynman Lectures on Physics”, Vol. II, Figure 41-6