Every heat engine
A) gains heat from a high-temperature reservoir.
B) converts energy into mechanical work.
C) expels heat to a lower-temperature reservoir.
D) all of the above
E) none of the above
Answer: D
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Fast moving, turbulent streams are highly erosive, they can
A) carry large sediment particles and a large volume of sediment. B) meander and flood into deltas. C) deposit only fine silts and muds. D) form U-shaped valleys from gullies.
Why is the Moon's average surface temperature so much lower than Earth's?
A. The Moon has no atmosphere to help retain heat at its surface. B. The Moon's rotation rate is much slower than Earth's. C. The Moon is much smaller than Earth and cooled more quickly. D. The Moon reflects more of the Sun's energy than Earth. E. The Moon has no magnetic field to prevent infrared radiation from escaping.
According to recent estimates, genetic contributions to the development of most psychological disorders are _________. *
Fill in the blank(s) with the appropriate word(s).
Which of the following procedures would not increase the fracture strength of a polycrystalline ceramic?
(a) Decreasing the porosity (b) Solid-solution alloy additions to increase the yield strength (c) Creating an acicular microstructure (d) Mixing ductile steel wires with the ceramic