A spaceship traveling at constant velocity passes by Earth and later passes by Mars. In which frame of reference is the amount of time separating these two events the proper time?
A) the Earth frame of reference
B) the Mars frame of reference
C) the spaceship frame of reference
D) any inertial frame of reference
E) any frame of reference, inertial or not
C
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How does an antiquark differ from a quark?
A) It has a different flavor. B) It has opposite mass. C) It has a much greater mass. D) It has opposite charge. E) It is much more common in nature.
Meteor showers are the result of collisions between asteroids
Indicate whether the statement is true or false
When the frequency of the source of a water wave increases, the distance between successive peaks in the wave
a. remains unchanged. b. increases. c. decreases. d. cannot be determined.
The existence of amino acids in carbonaceous chondrites proves that life on Earth originated in space.
Answer the following statement true (T) or false (F)