
College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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How fast must a meter stick be moving if its length is observed to shrink to half a meter by an observer on earth?
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- A beam of particles travels by at 2.0*10^8. At this speed you measure them to live 5.00* 10^6 sec, before decaying. What is the particle's life time at rest?arrow_forwardUsing knowledge from quantum mechanics and special relativity, answer: An astronaut takes a light emitting beacon in a spaceship travelling at 0.87 c away from a stationary observer on the Earth. If an observer from Earth notices the time between light pulses from the beacon are 4.50 s apart, calculate the proper time observed by the astronaut riding in the spaceship with the clock.arrow_forwardThe proper lifetime of a certain particle is 100.0 ns. How long does it live in the laboratory if it moves at v = 0.860c?arrow_forward
- A spaceship has proper length L_p and passes by a person standing on Earth. The personstanding on Earth measures that it takes time delta_t for the spaceship to pass a fixed point on theEarth. What is the speed (v) of the spaceship, according the person standing on Earth? Giveyour answer for v in terms of L_p, delta_t, and c (the speed of light).arrow_forwardHow fast is a rocket going it its passengers measure its length to be 25.5 but the people on earth watching it go by measure its length to be 18.8? Please give your answer as a fraction of c. For example, if v=1.5*10^ 8 m/s,use V/c=0.5 .arrow_forwardThe measured mean lifetime of an elementary particle when it is at rest in the lab is measured to be 2.6x10-8 s. If the particle is observed while traveling at a speed v=0.9 c with respect to the lab. What will be the value of the measured mean lifetime while the particle is moving?arrow_forward
- A car traveling at 35.0 m/s takes 26.0 minutes to travel a certain distance according to the driver’s clock in the car. How long does the trip take according to an observer at rest on Earth? Hint: The following approximation is helpful:arrow_forwardA spaceship that has a rest length of 200 m passes by earth at a speed in which only (1/4) x 10-6 s is required for it to pass by a given point as measured by clocks on earth. How fast is it moving and at what length (according to observers on earth)?arrow_forward
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