Molecular Speeds: At what temperature would the root mean square speed of oxygen molecules, O2, be 14.0 m/s if oxygen behaves like an ideal gas? The mass of one O2 molecule is 5.312 × 10-26 kg, and the Boltzmann constant is 1.38 × 10-23 J/K.
A. 0.251 K
B. 2090 K
C. 6270 K
D. 1.52 × 1023 K
Answer: A
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Why are there fewer large craters on the seafloor than on the continents?
A) The seafloor crust is younger than the continental crust. B) The oceans slow large impactors and prevent them from making craters. C) The oceans erode away craters faster than erosion processes on land. D) Large impactors primarily strike land masses. E) Large impactors aim for life-forms such as dinosaurs.
A 14-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?
a. 2.6 N b. 21 N c. 49 N d. 36 N e. 190 N
The element potassium should produce compounds most similar to those of
a. Tc. b. Na. c. Al. d. Sr.
Which is a key difference between electric charges and magnetic poles?
a. Electric charges can be separated while magnetic poles always occur together as opposite poles of equal strength. b. Magnetic monopoles exist but isolated electric charges are never found. c. Like electric charges repel but like magnetic poles attract. d. An electrically charged rod attracts an electrically neutral object but a magnet does not attract and unmagnetized chunk of iron. e. In electricity, unlike charges repel, but in magnetism, unlike poles attract.