A car starts from rest and travels a distance of 100 m in 20 seconds with a constant acceleration. The velocity of the car is at the end of the 20 second interval is
A. 25 m/s.
B. 20 m/s.
C. 15 m/s.
D. 10 m/s.
E. 5.0 m/s.
D. 10 m/s.
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The first postulate of special relativity states that ____
a. observers can always detect their uniform motion relative to other objects b. observers can never detect their uniform motion except relative to other objects c. the speed of light is constant regardless of location d. the speed of light in a vacuum is constant e. energy equals mass multiplied by the speed of light, squared
Triton has a retrograde orbit around Neptune. This means that ____________
a. Triton orbits in the same direction as Neptune rotates on its axis. b. Triton orbits in the opposite direction to the way Neptune rotates on its axis. c. Triton does not orbit around Neptune. Instead, it stands still.
Which person’s watch or clocks register(s) a coordinate time between those events in some inertial frame?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
Which of the following statements best describes the two principle advantages of telescopes over eyes?
A) Telescopes can collect far more light with far greater magnification. B) Telescopes have much more magnification and better angular resolution. C) Telescopes collect more light and are unaffected by twinkling. D) Telescopes can collect far more light with far better angular resolution.