3. Contraction of length question: To whom does an object seem greater in length, an observer moving with the object or an observer moving relative to the object? Which observer measures the object's proper length?
3. Contraction of length question: To whom does an object seem greater in length, an observer moving with the object or an observer moving relative to the object? Which observer measures the object's proper length?
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Transcribed Image Text:3. Contraction of length question: To whom does an object seem greater in length, an observer
moving with the object or an observer moving relative to the object? Which observer measures
the object's proper length?
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4. Relativistic energy question: Consider a thought experiment. You place an expanded balloon
of air on weighing scales outside in the early morning. The balloon stays on the scales and you
are able to measure changes in its mass. Does the mass of the balloon change as the day
progresses?
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