The portion of a shadow from which only part of the light is excluded by an opaque object is called the ______________
Fill in the blank(s) with correct word
penumbra
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Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical. B) their speeds are identical but their velocities are different. C) their speeds are different but their velocities are identical. D) their speeds are different and their velocities are different. E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.
It is desired to project the image of an object four times its actual size using a lens of focal length 20 cm. How far from the lens should the object be placed?
A) 100 cm B) 80 cm C) 4.0 cm D) 25 cm E) 5.0 cm
Atmospheric pressure is 105 N/m2 at sea level. This means that
1) a column of air 1 square meter in cross section extending up to the top of the atmosphere weighs 105 N, 2) the weight of one cubic meter of air at sea level is about 105 N, 3) the density of air is 105 N/m3, and the force of the atmosphere against a surface of one square meter is 4) somewhat less than 105 N. 5) about 105 N. 6) considerably more than 105 N.
In a sedimentary rock that contains inclusions of metamorphic rock, the inclusions must be
A) older than the sedimentary rock. B) younger than the sedimentary rock. C) on top of the sedimentary rock. D) below the sedimentary rock.