If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will
A) come to an abrupt stop at Earth's center.
B) speed up until it gets to Earth's center.
C) speed up until it reaches Earth's other side.
D) slow down until it reaches Earth's center.
Answer: B
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The luminosity class of a star tells an astronomer:
A) whether the star is close to us or far away B) whether or not the star is surrounded by planets C) whether the star is a supergiant, a giant, or a main-sequence star D) how long ago the star formed E) none of the above
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J
About 74% by mass of Earth's crust is composed of the two elements
a. oxygen and iron. b. aluminum and iron. c. oxygen and silicon. d. silicon and aluminum.
The meaning of the word "energy" is immediately clear to anyone
What will be an ideal response?