The "efficiency" of a heat engine is defined to be
A) thermal energy output divided by work input.
B) work output divided by thermal energy output.
C) work output divided by thermal energy input.
D) thermal energy output divided by thermal energy input.
C
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When an object is at rest, and stays at rest, it might have several forces acting on it. However,
A. the forces are all in the same direction. B. there can only be one force opposite gravity, since weight depends on mass. C. dynamic equilibrium can never be achieved except in the total absence of all forces. D. the forces balance out to net force of zero.
The zeroth latitude is at
a. 90°N. b. 90°S. c. the equator. d. the Greenwich Meridian.
Snell's Law: A plastic cube is immersed in water having an index of refraction of 1.33. A laser beam in the plastic strikes the interface at an angle of 14.5° with the normal in the plastic. In the water, this beam makes an angle of 21.8° with the normal. What is the speed of light in the plastic cube? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Sedimentary rocks subjected to melting become
A) lithified. B) metamorphic rocks. C) igneous rocks. D) limestone.