Why do vapor bubbles get larger in boiling water as they approach the surface?
a. They only appear to get larger, this being a magnification effect due to looking through the water.
b. The bubbles' pressure increases as they rise.
c. The pressure in the water decreases as the bubble moves toward the surface.
d. Bubbles always get bigger after they form.
C
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If the electromagnetic force is stronger than gravity, then why is it overpowered by gravity on large scales?
A) The electromagnetic force only works on scales of about the size of an atomic nucleus. B) The electromagnetic force follows an inverse cube law with distance, rather than an inverse square law. C) Electrical charge is canceled out by mass. D) Most objects are electrically neutral.
The study of the behavior of atoms and atomic particles is referred to as:
A) quantum mechanics. B) thermodynamics. C) the electromagnetic theory. D) theory of computations.
Magnetic Field of a Long Wire: Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires
A. points upward. B. points downward. C. points toward you. D. points away from you. E. is zero.
What are the latitudes of the tropics of Cancer and Capricorn?
A) 66.5°N and 66.5°S B) 23.5°N and 23.5°S C) 45.0°N and 45.0°S D) 32.5°N and 32.5°S