What is the most important role that the carbon dioxide cycle plays in the regulation of the Earth's climate?
A) it removes carbon dioxide from the atmosphere produced by respiration
B) it regulates the surface temperature by varying the amount of carbon dioxide in the atmosphere
C) it provides carbonate minerals in the oceans for aquatic life forms
D) it provides carbon dioxide in the atmosphere for photosynthesis
B
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A 2.0-C charge moves with a velocity of (
m/s and experiences a magnetic force of 
N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
What primary wavelength and corresponding photon energy is emitted by a body at:
(a) 400.°C? (b) 800.°C? (c) 1200.°C?
Motor oil, with a viscosity of 0.25 N ? s/m2, is flowing through a tube that has a radius of 3.0 mm and is 1.0 m long. The drop in pressure over the length of the tube is 200 kPa. What is the average speed of the oil?
A) 0.80 m/s B) 0.90 m/s C) 1.0 m/s D) 1.1 m/s E) 1.2 m/s
A ray of light traveling in water hits a glass surface. The index of refraction of the water is 1.33, and that of the glass is 1.50
At what angle with the plane of the surface must the incident ray strike the glass in order that the polarization of the reflected ray is the greatest? A) 36.9° B) 33.7° C) 48.4° D) 53.1° E) 41.6°