In this photo, water drops produce disturbances that move outward in circular patterns. What moves outward as drops hit the water's surface? (Hint: If a cork were floating on the water's surface, what would be its motion?)
a. The water at the surface.
b. The energy of neighboring water molecules.
c. Both a. and b.
b
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All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A) a gradual rise in the atmospheric content of oxygen B) changes in the Earth's axis tilt C) changes in the Earth's overall reflectivity D) changes in the atmospheric concentration of greenhouse gases
When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the terminal voltage of the battery falls 0.30 V. What is the internal resistance of this battery?
A) 3.60 ? B) 1.56 ? C) 0.98 ? D) 0.30 ? E) 0.51 ?
Consider two pairs of protons, one pair moving toward each other at a speed of 1000 km/s and the other at a speed of 10 km/s. Which pair of protons will get closer together before they repel each other?
A) The pair moving toward each other at 1000 km/s/ B) The pair moving toward each other at 10 km/s C) There will be no difference because the protons in both pairs will collide with each other. D) There will be no difference because they will repel at the same distance regardless of their speeds.
Using graphical methods, estimate the temperatue distribution and the heat transfer per meter depth between the two surfaces at the corner shown in Figure 2-60.
