A spaceship is observed from the Earth to be moving toward a star at a speed of 0.80 c. If the distance from the spaceship to the star is 1.6 ly as measured from earth, how much time passes on the space ship while traveling to the star?
A. 2.0 y
B. 2.1 y
C. 1.9 y
D. 1.2 y
E. 0.96 y
D. 1.2 y
Physics & Space Science
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Consider an infinite pipe that conducts current along its length. The magnetic field that this pipe creates is
A. unidirectional. B. circular. C. axial. D. None of the above.
Physics & Space Science
Which of the state vectors below is not physically equivalent to 
?
E. They are all equivalent.
Physics & Space Science
Sulfur has an atomic number of 16. What would be the valence number of this element?
A. One B. Two C. Three D. Four E. Six
Physics & Space Science
Based on current understanding, what exactly is causing the expansion of the universe to accelerate?
A) WIMPs B) neutrinos C) white dwarf supernovae D) Gravity E) We don't know, but we call it "dark energy."
Physics & Space Science