Chemically, clean [nonpolluted] air is
A) an isotope.
B) a mixture of different compounds.
C) an element.
D) a compound.
E) a liquid.
B
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Briefly explain the Fermi Paradox, namely the paradox of the question "Where are the aliens?"
What will be an ideal response?
To the surprise of Michelson and Morley, their interferometer experiment provided evidence that the speed of light is
A) invariant. B) the same whether its source approaches or recedes. C) constant. D) all of the above
A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5
A lump of clay is thrown at a wall. A rubber ball of identical mass is thrown with the same speed toward the same wall. Which statement is true?
a. The clay experiences a greater change in momentum than the ball. b. The ball experiences a greater change in momentum than the clay. c. The clay and the ball experience the same change in momentum. d. It is not possible to know which object has the greater change in momentum.