# Hw 12 - rguig(tr7356 Homework 12 yao(59020 This print-out...

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rguig (tr7356) – Homework 12 – yao – (59020) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points The operator of a space station observes a space vehicle approaching at a constant speed v . The operator sends a light signal at speed c toward the space vehicle. What is the speed of the light signal relative to the space vehicle? earthbound observer will seem greater than the lifetime seen by an observer moving with the muon. Using the time dilation equation, T = T 0 radicalbigg 2 1. c correct 2. c radicalbigg 1 - v 2 c 2 3. v radicalbigg 1 - v 2 c 2 4. c + v 5. c - v = 3585 s . What is the lifetime of this muon as mea- sured by an observer on the Earth? The lifetime of the muon as seen by the earthbound observer will seem greater than the lifetime seen by an observer moving with the muon. Using the time dilation equation, T = T 0 radicalbigg 2 003 10.0points Find the speed relative to Earth of a uni- formly moving spaceship whose clock runs 15 s slow per hour compared with an Earth-based clock. T = 3585 s .
rguig (tr7356) – Homework 12 – yao – (59020) 2 2. Length contraction reduces the apparent length. correct 3. Time dilation makes the lifetime of elec- trons longer. 4. Electrons travel faster than the speed of light. Explanation: For the moving electron, length contraction reduces the apparent length of the 2-mile long tube. Since electrons move with nearly the speed of light, the contraction is very signifi- cant. keywords: 005 10.0points A spaceship is measured to be 158 m long while at rest relative to the observer.