According to Einstein's theory of relativity, the universe is made of
A) matter and anti-matter.
B) radiation.
C) energy.
D) popcorn.
E) matter.
C
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The grooved terrain found on Ganymede is believed to be
a. flow channels or liquid water. b. flow channels or liquid methane. c. a system of faults in the crust. d. the peaks of water waves in a large ocean. e. caused by meteor impacts with the surface of Ganymede.
Why did the solar nebula flatten into a disk?
A) The interstellar cloud from which the solar nebula formed was originally somewhat flat. B) The force of gravity from the Sun pulled the material downward into a flat disk. C) As the nebula cooled, the gas and dust settled onto a disk. D) It flattened as a consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones. E) The force of gravity from the planets pulled the material downward into a flat disk.
A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A) 200 N B) 120 N C) 160 N D) 150 N E) 0 N
The International Date Line is a theoretical line following approximately the ______________ meridian
Fill in the blank(s) with correct word