?The angle between two plane mirrors that meet at one edge is 45°. The change in direction of a ray that strikes the first mirror at a 60°angle of incidence when that ray reflects from the second mirror is
A. ?0°.
B. ?45°.
C. ?90°.
D. ?150°.
E. ?270°.
Answer: D
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A dropped ball gains speed because
A) its velocity changes. B) a gravitational force acts on it. C) of inertia. D) its nature is to become closer to Earth.
When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 20 V. When the charge qa is removed, the potential at the midpoint becomes 15 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 12 V. What is the potential at the midpoint if only the charge
qc is removed from the array of charges? a. 8.0 V b. 5.0 V c. 7.0 V d. 13 V
A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = ?3.0 m. If Q = 50 ?C, what is the magnitude of the electrostatic force on a third point charge, ?Q, placed on the y axis at y = +4.0 m?
a. 2.5 N b. 3.0 N c. 3.7 N d. 4.4 N e. 1.8 N
Most of the deuterium that formed right after the Big Bang:
A) is still around today. B) broke down into electrons and neutrons. C) turned into dark matter. D) quickly burned into helium nuclei. E) was found in the globular clusters.