## ScienceDaily: Relativity and the twin’s paradox

September 24, 2010 by

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ScienceDaily (Feb. 15, 2007) — Subhash Kak, Delaune Distinguished Professor of Electrical and Computer Engineering at LSU, recently resolved the twin paradox, known as one of the most enduring puzzles of modern-day physics.

## ScienceDaily: Relativity and time dialation works in daily life

September 24, 2010 by

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Scientists have known for decades that time passes faster at higher elevations, and more slowly when you move faster, curious aspects of Einstein's theories

## Interactive tool: Practice estimating relative sizes

August 26, 2010 by

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Interactive tool for practicing comparing two lengths, areas, and volumes. It is VERY TRICKY to judge how area and volume change with size. This tool gives you good practice. Good for physics problems to do with pressure, gravity, and other places where area or volume are important. Explore size estimation in one, two and three dimensions! Multiple levels of difficulty allow for progressive skill improvement.

## Interactive tool: How does a function releate to its Derivative and Integral (PhET / UC Boulder)

August 26, 2010 by

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Interactive tool for showing how derivatives and integrals relate to a graph of a function. Really great for experimenting with the meaning of basic calculus ideas. Intuitive and graphical. Spend a little time playing to see where the derivative is zero, positive, negative, or how the integral grows. Draw a graph of any function and see graphs of its derivative and integral. Don't forget to use the magnify/demagnify controls on the y-axis to adjust the scale.

## Interactive tool: Curve fitting functions to data points (PhET / UCBoulder)

August 26, 2010 by

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Interactive tool for fitting a straight line or other curves to data points. Great supplement to any science lab course. Let's you see how data and mathematical models relate to each other. With your mouse, drag data points and their error bars, and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows you when the fit is good. Or you can try to find the best fit by manually adjusting fit parameters.

## Interactive simulation of Vector addition (PhET / UC Boulder)

August 26, 2010 by

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Interactive simulation of vector addition. Let's you practice adding vectors in arrow style to get a feel for the math. Learn how to add vectors. Drag vectors onto a graph, change their length and angle, and sum them together. The magnitude, angle, and components of each vector can be displayed in several formats.

## Interactive simulation of Graphing quadratic functions (PhET / UC Boulder)

August 26, 2010 by

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Interactive simulation on graphing 2nd degree polynomials (aka, quadratics). Nicely shows what each coefficient contributes. Learn about graphing polynomials. The shape of the curve changes as the constants are adjusted. View the curves for the individual terms (e.g. y=bx ) to see how they add to generate the polynomial curve. Especially good for constant acceleration problems in physics. These produce 2nd degree polynomials of distance vs time.