An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took 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
Answer: A
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The center of our galaxy is located in the direction of the constellation of Orion
Indicate whether the statement is true or false
An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
A. 32 J B. 52 J C. 41 J D. 25 J E. 29 J
AC voltage may be stepped up or stepped down using a(n) ______________
Fill in the blank(s) with correct word
The stars in our sky twinkle in brightness and color because of
A) turbulence in the Earth's atmosphere. B) rapid changes in the brightnesses and colors of stars caused by changes in their spectra. C) light pollution. D) the bubbling and boiling of gases on the surfaces of stars.