Brainteaser Physics: Challenging Physics Puzzlers by Göran Grimvall

By Göran Grimvall

Does a tumbler of ice water stuffed to the brim overflow while the ice melts? Does the power within a sauna elevate should you warmth it up? what is the most sensible technique to cool your espresso -- including the creamer first or final?

These and different tough puzzlers supply a clean -- and enjoyable -- method of studying actual physics. providing either vintage and new difficulties, Brainteaser Physics demanding situations readers to exploit mind's eye and simple physics rules to discover the solutions. Göran Grimvall presents precise and available motives of the recommendations, occasionally correcting the traditional factors, occasionally placing a brand new twist on them. He presents diagrams and equations the place acceptable and ends every one challenge by means of discussing a particular notion or supplying an additional challenge.

With Brainteaser Physics, scholars and veteran physicists alike can sharpen their serious and inventive considering -- and feature enjoyable while.

(June 12, 2007)

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Odometers measure the number of rotations of a wheel. The outer tire radius is about 30 cm (1 ft). A worn tire has a radius that is decreased by almost 2 %, and the odometer reading increases by the same amount. Perhaps you regularly drive a long distance with the same car and the same tire pressure. The difference between the distance recorded by the odometer when the tires are new, and some years later when the tires are worn, should be observable. As a curiosity we note that a 42 brainteaser physics taxi driver was once fined because he had put on wheels that were too small to charge his customers for driving longer distances.

This is not as innocent a problem as it might first seem. Many people with good scientific training have had heated arguments for either yes or no. 5 Site for Harbor A country has a long, almost straight shoreline, where there are no natural sites for a harbor. One therefore decides to build only one harbor, from which straight railways go to two cities, A and B (fig. 2). Can you locate the position of the harbor, which minimizes the total length of the railways, by geometrically constructing straight lines on the map rather than by directly measuring distances on the map or doing mathematical calculations?

Can you fill your car’s fuel tank with more or with less gasoline on a hot day? Because it is the chemical reaction of the fuel that pro32 brainteaser physics Fig. 2. Where should the harbor be located? vides the source of energy, it is the number of fuel molecules in the tank that is of interest. 7 High Tension You stand beneath an electric 400 kV power line with an ordinary magnetic compass in your hand. The power line runs in the north– south direction. In which direction does the red-painted part of the compass needle point?

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