Entropy: A 15.0-kg block of ice at 0.00°C falls into Lake Superior, which is a fresh water lake. The lake water is at 10.0°C, and the latent heat of fusion for ice is 3.34 × 105 J/kg. Find the change in entropy due to the melting of the ice (a) of the block of ice, (b) of the lake, and (c) of the system consisting of the lake and the ice. (d) Is your answer to part (c) consistent with the reversibility or irreversibility of the melting process?
What will be an ideal response?
(a) +1.84 × 104 J/K (b) -1.77 × 104 J/K (c) +648 J/K
(d) The process is irreversible, so ?S > 0.
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The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -4.5 nC B) +4.5 nC C) -5.0 nC D) +5.0 nC
Ice will float in water unless it is pushed or pulled under by an external force. Assume that someone pushes on a 3 cm3 cubic block of ice such that it is 0.5 m under water. Instead, to hold the ice at a point at which it is only just submerged requires a pushing force that is
1.less. 2.the same. 3.more. 4.impossible to determine.
Enrico Fermi was
A) the head of the program to develop the world's first fission bomb. B) the head of the program to develop the world's first fusion bomb. C) the inventor of radiation therapy. D) the discoverer of nuclear fission. E) the head of the program to develop the world's first nuclear reactor.
In the greenhouse effect, what is the direct cause of extra heating of the Earth's surface?
A) Additional carbon dioxide makes the atmosphere more transparent to infrared light, allowing the sun to more directly heat the surface. B) Additional carbon dioxide makes the atmosphere more opaque to infrared light, trapping more of the infrared light emitted by Earth. C) Additional carbon dioxide makes the atmosphere more dense, so heat passes through it more slowly. D) Additional carbon dioxide makes the atmosphere emit more infrared light which gets trapped near the surface of the Earth.