Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) 1. The laws of nature are the same for everyone.
2. The speed of light is the same for everyone.
B) 1. Everything is relative.
2. You can never really tell who is moving.
C) 1. You can't go faster than the speed of light.
2. Time is different for different people.
D) 1. The laws of nature are the same for everyone.
2. Everything is relative.
E) 1. The speed of light is the same for everyone.
2. You can't go faster than the speed of light.
A
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An electron travels under constant acceleration from a heated filament in an electron gun to the tip of the gun, where it is emitted. If the final speed of the electron is m/s, and the length of the gun from filament to tip is 1.25cm, what was the acceleration the electron underwent?
A.
B.
C.
D.
E.
F.
The Galactic Year is the time for our solar system to orbit the Galaxy; it is about:
A) 15 million years. B) 225 million years. C) 4.5 billion years. D) 9.6 billion years. E) 13.5 billion years.
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 378 Hz B) 389 Hz C) 411 Hz D) 422 Hz E) 450 Hz
The energy radiated by a typical quasar requires that its black hole accrete about
A) one solar mass a year. B) ten solar masses a year. C) one solar mass a day. D) one solar mass a decade. E) one solar mass a century.