The best answer to both the flatness and horizon problems is
A) the Steady State Theory.
B) the GUT theory.
C) the inflationary epoch.
D) dark energy.
E) decoupling.
C
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Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100. m from the mothership. She throws her 2.00 kg wrench at 20.0 m/s in a direction away from the ship
If she and her spacesuit have a combined mass of 200. kg how long does it take her to coast back to her spaceship? A) 1000. s B) 750. s C) 250. s D) 2.50 minutes E) 500. s
Two separate pairs of binary stars are observed. The separation of the pairs is identical, but the orbital period of Pair X is 4 times the orbital period of Pair Y
How does the total mass of the stars in Pair X compare to the total mass of the stars in Pair Y? A) Pair X has a total mass 2 times greater than Pair Y. B) Pair Y has a total mass 2 times greater than Pair X. C) Pair Y has a total mass 16 times greater than Pair X. D) Pair X has a total mass 16 times greater than Pair Y.
The aberration of starlight gives proof that Earth is
a. rotating. b. revolving. c. precessing. d. none of these.
A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?
A) 0.422 m/s2 B) 4.91 m/s2 C) 46.9 m/s2 D) 0.206 m/s2 E) 9.81 m/s2