Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 0.5c B) 0.1c C) 0.7c D) 0.9c E) 0.3c
C
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If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact. B) of injuries suffered from direct hits of pieces of the asteroid or comet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes worldwide.
Interstellar clouds usually form groups of stars that leave the main sequence at the same time.
Answer the following statement true (T) or false (F)
According to Aristotle, which of these is a "natural" or "unforced" motion?
A) A book coming to rest as it slides along the floor. B) A stone falling straight downward. C) Both of the above. D) Neither of the above.
A bobsled makes a run down an ice track starting at 250 m vertical distance up the hill. If there is no friction, what is the velocity at the bottom of the hill?
a. 35.0 m/s b. 49.5 m/s c. 46.7 m/s d. 70.0 m/s e. 58.3 m/s