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1093_Physics ProblemsTechnical Physics

1093_Physics ProblemsTechnical Physics - 434 Relativity...

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434 Relativity Q39.9 By a curved line. This can be seen in the middle of Speedo’s world-line in Figure 39.12, where he turns around and begins his trip home. Q39.10 According to p u = γ m , doubling the speed u will make the momentum of an object increase by the factor 2 4 2 2 2 2 1 2 c u c u L N M O Q P . Q39.11 As the object approaches the speed of light, its kinetic energy grows without limit. It would take an infinite investment of work to accelerate the object to the speed of light. Q39.12 There is no upper limit on the momentum of an electron. As more energy E is fed into the object without limit, its speed approaches the speed of light and its momentum approaches E c . Q39.13 Recall that when a spring of force constant k is compressed or stretched from its relaxed position a distance x , it stores elastic potential energy U kx = 1 2 2 . According to the special theory of relativity, any change in the total energy of the system is equivalent to a change in the mass of the system.
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