- Engineering Formulas - eFunda
Formulas, derivations, diagrams, and online calculators. Fluid mechanics topics include the Navier-Stokes equation, the Bernoulli equation, Reynold's number, pipe friction, manometer, and Venturi flowrate. Mechanics and materials topics: stress/strain, Mohr's circle, Hooke's law, Young's modulus, Rosette strain gage, and principal stress calculation. Vibrations topics: undamped vibration, damped vibration, forced vibration, multiple degree-of-freedom (DOF) system, accelerometer, and spring-mass calculation. Heat transfer topics: conduction, insulation, R-value, free convection, forced convection, and radiation. Failure criteria topics: maximum shear criterion, von Mises criterion, maximum stress criterion, ductile yield calculation, and brittle failure calculation. Finance topics: annual percentage rate, money factor, loan calculator, and lease calculator. Beam mechanics topics: Euler beam theory, cantilevers, simply supported beams, mixed supported beams, and beam cross sections (all, w-type, s-type, channels). Column buckling topics: elastic buckling, inelastic buckling, critical loads, eccentric loading, and buckling calculation. Access the site free for a limited time during any browser session; register and pay for unlimited access.
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- The Eyeballing Game - Matthias Wandel
Test your ability to "eye up" geometric figures with this timed Flash challenge. First consult the help documentation to correctly calibrate your monitor resolution and aspect ratio; then click and drag the blue ray or point to accurately construct the indicated parallelogram, segment midpoint, angle bisector, triangle center, circle center, right angle, or convergence of three intersecting rays. Wandel, a woodworker, developed the eyeballing game because he suspected great variation in peoples' ''ability to notice that things might be just a little off square, off centre, or not quite straight."
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- Hamilton's Math to Build On - Johnny & Margaret Hamilton
Simple, straightforward explanations, drawings, questions and answers from the book Math to Build On by Johnny & Margaret Hamilton (copyright 1993). Excerpts offer pages on: Angles, Degrees, Variables & Constants; Squaring Numbers; Square Roots; Right Triangles; Memory Aids: Fractions & Decimals, Functions; and Seeing is Believing (constructions for the classroom); and a Glossary. Math for the construction trades, for elementary and middle-school level students, or for those wishing to brush up on math they once knew but have forgotten.
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