An auto moves at a steady 50 mph down a straight level road. The net force on the auto is
A) downward. B) forward. C) sideways. D) zero. E) backward.
D
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What causes spherical aberration?
A. the lens surface is not perfectly smooth B. the outer edges of the lens produce a focus at a different point than the central rays C. light is an electromagnetic wave with intrinsic diffraction properties D. the absorption of light in the glass is a function of wavelength
The "flatness" problem arises because the curvature of space seems remarkably close to
A) zero curvature, favoring a spherical cosmos. B) exactly one. C) .5, suggesting we are split between open and closed universes. D) 2.73 K, in spite of the eddies and turbulence that led to galaxy formation. E) infinity, suggesting an open universe is the only possible cosmology.
The amount of light reaching the film in a camera is determined by the
A) shutter speed. B) f-stop. C) focal length of the lens.. D) focusing. E) diameter of the aperture.
What organic compound is represented by a hexagon with a circle inside?
a. Cyclohexane b. Cycloheptane c. Benzene d. Ethanol e. Methane