By Boltzmann L.
Dieses Wort Faust's ist wohl Niemandem so sehr aus der Seele gesprochen wie dem, der über die wahre Natur der Elektricität vortragen will. Möge guy daher dies bischen Poesie als Einleitung zu trockenen Formeln nicht mit allzu schelen Augen ansehen... - Ludwig Boltzmann
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Extra info for Vorlesungen ueber Maxwells Theorie der Elektrizitaet
Sample text
Can a ball that’s heading upward still be falling? How does gravity affect a ball that’s thrown sideways? Experiments to Do: A few seconds with a baseball will help you see some of the behaviors that we’ll be exploring. Toss the ball into the air to various heights, catching it in your hand as it returns. Have a friend time the flight of the ball. As you toss the ball higher, how much more time does it spend in the air? How does it feel coming back to your hands? Is there any difference in the impact it makes?
If your car is traveling 200 kilometers per hour and you pass a police car, are you in trouble? Yes, because 200 kilometers per hour is about 125 miles per hour. Actually, the hour is not an SI unit—the SI unit of time is the second—but the hour remains customary for describing long periods of time. Thus the kilometer per hour is a unit that is half SI (the kilometer part) and half customary (the hour part). The second characteristic of the SI system is its relatively small number of basic units.
In the present case, you see yourself as motionless because you view the world from your own inertial frame. 6 ft/s). However, your friend sees things differently. In your friend’s inertial frame, your friend is motionless and you are coasting eastward at 2 m/s. As long as the two of you don’t try to compare the positions or velocities of the objects you observe, or certain physical quantities derived from those values, there will be no disagreements and no inconsistencies. However, if you forget to watch where you’re going and crash into a wall, don’t expect your friend to sympathize when you claim that you were motionless and that the moving wall ran into you.