What is the maximum theoretical efficiency possible for a heat engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atmosphere for both reservoirs
A) 27%
B) 45%
C) 73%
D) 17%
A
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The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. E. B. F. C. G. D. H. E. A.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest in m/s is
a. 0. b. 2. c. 4. d. 8. e. 16.
Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because when elements split in a fission reaction, they prefer to split with all the protons paired B) because elements are mainly made in fusion reactions with hydrogen nuclei C) because elements are mainly made in fusion reactions with helium nuclei D) There's no explanation; it's something of a mystery to be explained or it may be a coincidence.
The processes of giant-planet migration and the formation of the Oort Cloud caused the Uranus to move both inward and outward in the solar system. Which motion was most important? Why?
What will be an ideal response?