A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance
What maximum elevation does the rocket reach?
A) 327 m B) 487 m C) 160 m D) 408 m E) 320 m
B
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Temperature Scales: The temperature in your classroom is closest to
A. 68 K. B. 68°C. C. 50°C. D. 295 K.
Length Contraction: How fast must a meter stick move, relative to the frame of the observer making the measurement, so its length will be measured to be 0.60 m?
A. 0.40c B. 0.60c C. 0.70c D. 0.80c E. 0.90c
Brewster's Angle: When unpolarized light from air (with refractive index 1.00) strikes a piece of glass with index of refraction 1.80, the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
Fill in the blank(s) with the appropriate word(s).
Cosmic inflation caused the universe to expand, for a brief period, at faster than lightspeed. But special relativity says that nothing can move faster than lightspeed. How can this contradiction be resolved?
A) The laws of physics (conservation of energy, special relativity, etc.) as we presently know them were not valid during the "inflationary period" that existed for a fraction of a second into the big bang. B) We now realize that special relativity does not apply to dark energy. C) Special relativity says nothing can move through space at faster than lightspeed, but doesn't restrict the speed at which space can expand. D) It hasn't yet been resolved, but scientists are working on resolving it. E) The laws of specially relativity were not valid during the inflationary period, but the other laws (such as conservation of energy) were valid.