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10 cards from this deck
Objects moving at high speeds appear shorter in direction of motion relative to stationary observer
Length measured by observer at rest relative to the object
l=l01−v2c2l = l_0 \sqrt{1 - \frac{v^2}{c^2}}l=l01−c2v2
lll decreases, object appears shorter
Only length in direction of motion, not width or height
Muon decay experiments
180 m
6.0×10−76.0 \times 10^{-7}6.0×10−7 s
Expected: 76 s−1s^{-1}s−1, Observed: 80 s−1s^{-1}s−1 (close match)
Should not be applied simultaneously in single calculation
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