Compare two diverging lenses similar except that lens B is rated at 20 Diopters, whereas lens A is rated at 10 Diopters. The focal length of lens B is
A) twice the focal length of lens A.
B) one-fourth of the focal length of lens A.
C) one-half of the focal length of lens A.
D) 1/ of the focal length of lens A.
E) four times the focal length of lens A.
C
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Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be
A) along their directions of travel. B) perpendicular to their directions of travel. C) toward the Sun. D) none of the above
The discovery of seafloor spreading led to acceptance of the theory of ______________
Fill in the blank(s) with correct word
Density: A compressed gas with a total mass of 107 kg is stored in a spherical container having a radius of 0.521 m. What is the density of the compressed gas?
A. 181 kg/m3 B. 110 kg/m3 C. 134 kg/m3 D. 161 kg/m3
All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle. B. they do not operate through a reversible cycle. C. the working substance does not maintain a constant volume through the cycle. D. the working substance does not maintain a constant pressure through the cycle. E. the working substance does not maintain a constant temperature through the cycle.