An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took 7.49 y. How long does this journey take as measured by someone at rest relative to the two stars?
A) 20.0 y
B) 2.81 y
C) 4.05 y
D) 22.1 y
A
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Stars of less than 8 solar masses will not go supernova
Indicate whether the statement is true or false
A particle starts from the origin at t = 0 with a velocity of 
m/s and moves in the xy plane with a constant acceleration of 
m/s2. What is the speed of the particle at t = 2.0 s?
A. 52 m/s B. 39 m/s C. 46 m/s D. 33 m/s E. 43 m/s
Which statement about gamma ray bursters is NOT correct?
A) Millisecond flickering implies they are tiny in size. B) In seconds, they radiate enormous amounts of energy. C) They seem to be coming from far beyond our own Milky Way. D) They are scaled up X-ray bursters, with more massive objects involved. E) The beams may be bipolar ejections from the hypernova formation of black holes.
The stratosphere and the troposphere account for ______________ of the mass of the atmosphere
a. 80% b. 90% c. 99.9% d. 78.1%