A column of contained air extends from sea level to the top of the atmosphere. The contained air has mass. If the column instead contained the same mass of water, its height would be
A) 1/13.6 times as high as the atmosphere.
B) about 3/4 m high.
C) 10.3 m high.
D) about 5.6 km high.
Answer: C
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What is a "wormhole"?
A) a hypothetical connection through hyperspace between two points in the universe B) an observationally confirmed feature of the universe that allows interstellar travel and time travel C) another name for the shortest path between two points D) the opposite of a black hole; it ejects mass and energy out of it and nothing can enter
Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there. B) They are held in place by resonances with other asteroids. C) Actually, we never see asteroids in the gaps. D) They are kept in place by shepherding asteroids. E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
A stone thrown horizontally from a cliff with an initial speed of 10 m/s hits the bottom of the cliff in 4.3 s. What is the height of the cliff?
A. 22 m B. 43 m C. 69 m D. 91 m
Newton's third law of motion states that whenever one object exerts a force upon a second object, the second object exerts a(n) ______________ and ______________ force upon the first object
Fill in the blank(s) with correct word