Questions
Question 1
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What does it mean for two events to be simultaneous in a given frame?
Question 2
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Is simultaneity absolute in special relativity?
Question 3
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State the Lorentz time-difference formula for frames moving along the \(x\)-axis.
Question 4
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Two events occur at the same place in \(S\) with \(\Delta t=2.00\,\mu\mathrm s\). If \(S'\) moves at \(0.600c\), find \(\Delta t'\).
Question 5
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Two events are simultaneous in \(S\) and separated by \(300\,\mathrm m\) along \(+x\). Frame \(S'\) moves at \(0.500c\). Find the sign of \(\Delta t'\).
Question 6
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Why is the relativity of simultaneity not just a delay caused by light travel time?
Question 7
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Two events are simultaneous in \(S\), separated by \(900\,\mathrm m\). Frame \(S'\) moves at \(0.600c\). Find \(\Delta t'\).
Question 8
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Two lightning strikes hit the front and back of a train at the same time in the track frame. Explain why the train frame can disagree.
Question 9
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Find the speed \(v\) for which two events with \(\Delta x=600\,\mathrm m\) and \(\Delta t=1.00\,\mu\mathrm s\) are simultaneous in \(S'\).
Question 10
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Two events have \(\Delta x=900\,\mathrm m\) and \(\Delta t=1.00\,\mu\mathrm s\) in \(S\). Frame \(S'\) moves at \(0.600c\). Find \(\Delta t'\).
Question 11
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For two events simultaneous in \(S\), derive the moving-frame time separation.
Question 12
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Two events have \(\Delta x=300\,\mathrm m\). What value of \(\Delta t\) in \(S\) would make them connected by a light signal?
Question 13
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Explain why two events at the same place in one frame cannot have their time order reversed by another inertial frame.
Question 14
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Two events are separated by \(\Delta x=1.20\,\mathrm{km}\) and are simultaneous in \(S\). Find \(\Delta t'\) for \(v=0.750c\).
Question 15
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A frame \(S'\) moves in the negative \(x\)-direction relative to \(S\). If two events are simultaneous in \(S\) with \(\Delta x>0\), what is the sign of \(\Delta t'\)?
Question 16
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Show that if two events can be connected by a light signal, no inertial frame can make them simultaneous.
Question 17
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Use \(\Delta t'=\gamma(\Delta t-v\Delta x/c^2)\) to explain why only separated events can show relativity of simultaneity.
Question 18
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A student argues that if observers disagree on simultaneity, one observer must be wrong. Give a relativistic correction.
Question 19
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Two events have \(c\Delta t=400\,\mathrm m\) and \(\Delta x=1000\,\mathrm m\). Can their order be reversed by changing inertial frame?
Question 20
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Derive the condition for a frame in which two events are simultaneous, and state when that frame is physically allowed.