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Extra info for Czech Republic - Outdoor Holidays
At her return on Earth, 44 000 years have passed. net low counter maximum speed, observers at rest, and motion of light 47 observations by the pilot observations by the farmer pilot time farmer time barn ends F I G U R E 26 The observations of the pilot and the barn owner. Challenge 54 e Ref. 54 Challenge 55 s started. The necessary amount of fuel does not exist on Earth. The same problem appears for shorter trips. We also found that we cannot (simply) synchronize clocks at rest with respect to each other simply by walking, clock in hand, from one place to another.
32 Can one shoot faster than one’s shadow? Challenge 27 e Ref. 33 ” Antiquity For Lucky Luke to achieve the feat shown in Figure 17, his bullet has to move faster than the speed of light. ) In order to emulate Lucky Luke, we could take the largest practical amount of energy available, taking it directly from an electrical power station, and accelerate the lightest ‘bullets’ that can be handled, namely electrons. This experiment is carried out daily in particle accelerators such as the Large Electron Positron ring, the LEP, of 27 km circumference, located partly in France and partly in Switzerland, near Geneva.
The space-time interval di of equation (16) has a simple physical meaning. It is the time measured by an observer moving from event (t, x) to event (t + dt, x + dx), the socalled proper time, multiplied by c. If we neglect the factor c, we can also call the interval the wristwatch time. In short, we can say that we live in space-time. Space-time exists independently of all things; it is a container, a background for everything that happens. And even though coordinate systems differ from observer to observer, the underlying entity, space-time, is the same and unique, even though space and time by themselves are not.