When a particle and antiparticle meet, they are said to annihilate each other. What does this mean?
a. They explode into tiny fragments.
b. They are destroyed, and turned into an equivalent amount of energy.
c. They merge and simply disappear.
d. none of the above
b
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If the Moon's orbital plane was aligned with the celestial equator we could
a. have eclipses every month. b. never have eclipses. c. have eclipses only at solstice. d. have eclipses only at the equinoxes.
Troops break step when marching across a bridge to prevent
A) interference. B) resonance. C) wave motion. D) frequency distortion.
An inverted empty jar is pushed downward into water so that trapped air inside can't escape. As it is pushed deeper, the buoyant force on the jar
A) increases. B) decreases. C) remains the same.
The quantity of work equal to one joule is also equivalent to which of the following?
a. watt c. watt × s b. watt /s d. watt /s2