In the chemical formula for water, H2O, what does the "2" mean?
a. There are two oxygen (O) atoms in a molecule of water.
b. There are two hydrogen (H) atoms in a molecule of water.
c. The hydrogen in water is actually deuterium.
d. none of the above
B
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A spring is stretched from its equilibrium position 10 cm when a 1 kg mass is attached to it. Removing the 1 kg mass and replacing it with a 0.50 kg mass then releasing the spring, how high will the 0.50 kg mass rise above the point where it is released?
A. 0.44 m B. 0.24 m C. 0.80 m D. 1.0 m
Granitic pebbles with a radiometric age of 300 million years are embedded in a sedimentary rock. A dike, dated at 200 million years, intrudes into the sedimentary rock
With all this information we can estimate the age of the sedimentary rock to be A) older than 300 million years. B) younger than 200 million years. C) between 200 and 300 million years old. D) precisely 300 million years old.
Which is the most abundant greenhouse gas in Earth's atmosphere?
A) nitrogen. B) water vapor. C) carbon dioxide. D) none of the above
A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 5.0-kg box pushing it against the 3.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N