If an elephant grows proportionally to twice its height, its weight would be multiplied by about
A) 2.
B) 4.
C) 6.
D) 8.
E) none of the above
Answer: D
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In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
a. 2.0 s b. 3.0 s c. 6.0 s d. 9.0 s e. 18.0 s
Massive stars cannot generate energy through iron fusion because
a. iron fusion requires very high density. b. stars contain very little iron. c. no star can get hot enough for iron fusion. d. both fusion or fission of iron nuclei absorb energy e. massive stars supernova before they create an iron core.
Most of the craters on the Moon are relatively young
a. True b. False Indicate whether the statement is true or false
When a comet like Comet Hale-Bopp comes closest to the Sun in its orbit, we say that it is at:
a. apogee b. the minimum angular momentum point c. perihelion d. circular satellite velocity e. the tail end of its journey