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**Unformatted text preview: **contracted in the direction of motion. The equation for length contraction is / p L L = [26.4] where L is the length measured by an observer in motion relative to the object and L p is the proper length measured by an observer for whom the object is at rest. 3. Events that are simultaneous for one observer are not simultaneous for another observer in motion relative to the first. Section 26.5: Relativistic Momentum The relativistic expression for the momentum of a particle moving with velocity v is mv p = [26.5] Section 26.6: Relativistic Energy and the Equivalence of Mass and Energy The rest energy of an object is 2 mc E R = [26.7] The total energy of an object is R E E = [26.9] The kinetic energy of an object is the difference between the total energy and the rest energy: ) 1 ( 2 = = mc E E K R [26.7] Momentum is related to the total energy through the equation 2 2 2 2 R E c p E + = [26.10]...

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