Jill claims that her new rocket is long. As she flies past your house, you measure the rocket’s length and find that it is only What is Jill’s speed, as a fraction of ?
Jill have a speed
We have given that the length of the new rocket is .
We need to find Jill’s speed.
Solve from equation (1)
Jill's speed is from speed of light
A 30-m-long rocket train car is traveling from Los Angeles to New York at 0.50c when a light at the center of the car flashes. When the light reaches the front of the car, it immediately rings a bell. Light reaching the back of the car immediately sounds a siren.
a. Are the bell and siren simultaneous events for a passenger seated in the car? If not, which occurs first and by how much time?
b. Are the bell and siren simultaneous events for a bicyclist waiting to cross the tracks? If not, which occurs first and by how much time?
Teenagers Sam and Tom are playing chicken in their rockets. As FIGURE Q36.2 shows, an experimenter on earth sees that each is traveling at as he approaches the other. Sam fires a laser beam toward Tom.
a. What is the speed of the laser beam relative to Sam?
b. What is the speed of the laser beam relative to Tom?
Your friend flies from Los Angeles to New York. She carries an accurate stopwatch with her to measure the flight time. You and your assistants on the ground also measure the flight time.
a. Identify the two events associated with this measurement.
b. Who, if anyone, measures the proper time?
c. Who, if anyone, measures the shorter flight time?
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