If water at 20°C slightly increases in temperature, the water
A) expands.
B) contracts.
C) remains the same.
Answer: A
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When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.
The most important highlight of Precambrian Time was the
A) explosion of life. B) asteroid impact that resulted in the formation of our Moon. C) accumulation of free oxygen in the atmosphere. D) emergence of reptiles.
When a tennis racquet hits a ball,
A) the racquet loses as much speed as the ball gains. B) the ball is set in motion with the same speed of the racquet upon contact. C) the ball hits the racquet. D) all of the above
The Big Bang was an expansion of matter into empty space
Indicate whether the statement is true or false