It is easier to significantly alter Earth's O3 balance than its O2 balance because
A) O3 is a trace molecule in the atmosphere whereas O2 is not.
B) it is so much easier to produce O3.
C) O3 is a very unstable molecule whereas O2 is stable.
D) O3 is a highly reactive molecule whereas O2 is inert.
E) O3 is an inert molecule whereas O2 is highly reactive.
A
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Water (density = 1 × 10^3 kg/m3) flows at 10 m/s through a pipe with radius 0.040 m. The pipe goes up to the second floor of the building, 2.0 m higher, and the pressure remains unchanged. What is the radius of the pipe on the second floor?
a. 0.045 m c. 0.015 m b. 0.034 m d. 0.012 m
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. In what direction does the wreckage move just after the collision?
A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E
A sound source is placed in the center of a very wide and long room that has a low ceiling. Assume that the ceiling and floor are constructed of a material that absorbs the sound completely. In this situation, how would the intensity of the sound heard vary if a person moves from a distance of 10 meters from the source to a distance of 20 meters from the source?
1.The sound would have about ¼ the intensity 20 m from the source that it has 10 m from the source. 2.The sound would have about ½ the intensity 20 m from the source that it has 10 m from the source. 3.The sound would have about the same intensity 20 m from the source that it has 10 m from the source. 4.The sound would have about twice the intensity 20 m from the source that it has 10 m from the source.
If star A is closer to us than star B, then Star A's parallax angle is
A) larger than that of Star B. B) smaller than that of Star B. C) hotter than that of Star B. D) fewer parsecs than that of Star B.