Buoyancy: A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A. the wood
B. the iron
C. Both have the same buoyant force.
D. It cannot be determined without knowing their densities.
Answer: B
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The surface of the Sun is at approximately 5700 K, and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 2000 J of heat energy is transferred from the Sun to the Earth?
a. 5.78 J/K c. 7.24 J/K b. 5.97 J/K d. 6.55 J/K
The energy source for a generator may be
A) a waterfall. B) steam from a turbine. C) wind. D) any of these E) none of the above
Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.
Of all the chemical elements, the one most crucial to the complexity of life is:
A) hydrogen. B) oxygen. C) sulfur. D) carbon. E) nitrogen.