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An alarm clock is set to go off in one hour when it is at rest. The alarm clock is set in motion at 0.95 times the speed of light.

  1. Calculate how long it would take the alarm to go off for stationary observers watching it move away at 0.95 c.
  2. How long would the alarm take to go off for an observer travelling with the alarm clock? 

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Earthquakes produce several types of shock waves. The best knownare the P-waves (P for primary or pressure) and the S-waves (S forsecondary or shear). In the earth's crust, P-waves travel at around6.40 {\rm km}/{\rm s} while S-waves move at about 3.50 {\rmkm}/{\rm s}. (The actual speeds vary with the type of material thewaves are going through.) The time delay between the arrival ofthese two types of waves at a seismic recording station tellsgeologists how far away the earthquake that produced the wavesoccurred.
f the time delay at a seismic station is 38.0 {\rm s}, how far fromthat station did the earthquake occur?
One form of earthquake warning system detects the faster (but lessdamaging) P-waves and sounds an alarm when they first arrive,giving people a short time to seek cover before the more dangerousS-waves arrive. If an earthquake occurs 373 {\rm km} away from sucha warning device, how much time would people have to take coverbetween the alarm and the arrival of the S-waves?

Earthquakes produce several types of shock waves. The best knownare the P-waves (P for primary or pressure) and the S-waves (S forsecondary or shear). In the earth's crust, P-waves travel at around6.40 {\rm km}/{\rm s} while S-waves move at about 3.50 {\rmkm}/{\rm s}. (The actual speeds vary with the type of material thewaves are going through.) The time delay between the arrival ofthese two types of waves at a seismic recording station tellsgeologists how far away the earthquake that produced the wavesoccurred.
If the time delay at a seismic station is 38.0 {\rm s}, how farfrom that station did the earthquake occur?
One form of earthquake warning system detects the faster (but lessdamaging) P-waves and sounds an alarm when they first arrive,giving people a short time to seek cover before the more dangerousS-waves arrive. If an earthquake occurs 373 {\rm km} away from sucha warning device, how much time would people have to take coverbetween the alarm and the arrival of the S-waves?


Earthquakes produce several types of shock waves. The best knownare the P-waves (P for primary or pressure) and the S-waves (S forsecondary or shear). In the earth's crust, P-waves travel at around6.40 {\rm km}/{\rm s} while S-waves move at about 3.50 {\rmkm}/{\rm s}. (The actual speeds vary with the type of material thewaves are going through.) The time delay between the arrival ofthese two types of waves at a seismic recording station tellsgeologists how far away the earthquake that produced the wavesoccurred.
f the time delay at a seismic station is 38.0 {\rm s}, how far fromthat station did the earthquake occur?
One form of earthquake warning system detects the faster (but lessdamaging) P-waves and sounds an alarm when they first arrive,giving people a short time to seek cover before the more dangerousS-waves arrive. If an earthquake occurs 373 {\rm km} away from sucha warning device, how much time would people have to take coverbetween the alarm and the arrival of the S-waves?

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