What is proper time?
a. Proper time is the time measured by a clock at rest with respect to the observer.
b. Proper time is time based on your actual longitude, not your time zone.
c. Proper time is the time given on your GPS.
d. Proper time means standard time as opposed to daylight savings time.
A
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Why is the surface of Mercury more level (flatter) than the surface of the Moon?
A. Heat from the Sun made Mercury's surface softer and more malleable. B. The Moon formed out of the debris from a collision of two larger bodies. C. Mercury has stronger gravity and had a hotter interior. D. Tidal forces from Earth have pulled the Moon out of shape.
Glass is transparent to
A) infrared light. B) visible light. C) ultraviolet light. D) all of the above
Mesons are composed of three-quark combinations
a. True b. False Indicate whether the statement is true or false
The apparent brightness of stars is ranked according to magnitude. The brightest stars were originally ranked as what magnitude?
a. Zero b. Sixth c. First d. None of the above