Download PDF by Göran Grimvall: Brainteaser Physics: Challenging Physics Puzzlers

By Göran Grimvall

ISBN-10: 0801885124

ISBN-13: 9780801885129

ISBN-10: 1435692136

ISBN-13: 9781435692138

Does a pitcher of ice water crammed to the brim overflow whilst the ice melts? Does the power inside of a sauna elevate in the event you warmth it up? what is the most sensible option to cool your espresso -- including the creamer first or final?

These and different not easy puzzlers offer a clean -- and enjoyable -- method of studying actual physics. offering either vintage and new difficulties, Brainteaser Physics demanding situations readers to take advantage of mind's eye and easy physics rules to discover the solutions. Göran Grimvall offers precise and available factors of the suggestions, occasionally correcting the traditional reasons, occasionally placing a brand new twist on them. He offers diagrams and equations the place acceptable and ends each one challenge through discussing a particular thought or providing an additional challenge.

With Brainteaser Physics, scholars and veteran physicists alike can sharpen their severe and inventive pondering -- and feature enjoyable even as.

(June 12, 2007)

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Additional resources for Brainteaser Physics: Challenging Physics Puzzlers

Example text

In a description of an actual physical phenomenon, we make use of a model. That means a simplification—certain e¤ects are just ignored, while others are included. For instance, one would not try to include the Earth’s magnetic field in a model that describes the damage when two cars collide on a highway. But in some cases a model may leave out aspects that cannot be ignored. Our problem with the two capacitors is an illustration of that. ten hits 23 Fig. 14. When the valve connecting the full and the empty tank is opened and equilibrium is reached, the total potential energy of the water is halved.

But the same amount of water that is fed through the tube into the turbine must also leave the tube after the turbine. If A1 is the cross-section area and v1 is the water speed in the tube before the turbine, with A2 and v2 describing the flow after the turbine, you must have A1v1 = A2v2 This is a simple version of the continuity equation. It is now obvious that A2 must be much larger than A1, so that we get v2 << v1. The figure, therefore, is very misleading. A real hydroelectric power plant can be constructed in such a way that more than 95 % of the potential energy of the water is converted to electrical energy.

On the other hand, if the paddles are immobile, they can halt the water flow completely. But then no generator is rotating, and the power is again zero. The optimum energy conversion, 16/27 = 59 % of the power in the incoming flow, is obtained as a compromise between these two extremes. Obviously the turbine system in a hydroelectric power plant has a much more complicated geometry, so that almost all of the water’s energy can be used. How physicists think. Knowledge is in part to remember facts, but the absence of known facts also can contain information.

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Brainteaser Physics: Challenging Physics Puzzlers by Göran Grimvall


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