On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
A) the atmosphere is denser higher up than it is at the earth's surface.
B) the temperature of the upper atmosphere is higher than it is at the earth's surface.
C) the sunlight travels over a longer path at the horizon, resulting in more absorption.
D) the atmosphere is more reddish over the ocean.
C
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An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
A. negative y direction B. positive y direction C. negative z direction D. positive z direction E. negative x direction
A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
a. at the 40-cm mark b. at the 45-cm mark c. at the 50-cm mark d. at the 55-cm mark e. at a position not given
In general, cold days are associated with
A) high surface pressure. B) low surface pressure. C) snow. D) a pressure-gradient force.
Alkali metals have how many electrons past the noble gas configuration?
A. 1 B. 2 C. 3 D. 4 E. 5