Alternating current is normally produced by a
A) battery.
B) generator.
C) both of these
D) neither of these
Answer: B
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Free Fall: A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
A. Its acceleration is constantly increasing. B. Its acceleration is constant. C. Its acceleration is constantly decreasing. D. Its acceleration is zero. E. Its acceleration is greater than g.
The density of interstellar dust is very low, yet it still blocks starlight because:
A) it is so cold it absorbs higher energy photons. B) there is 100 times more opaque gas than dust present in the ISM. C) the dust particles are about the same size as the light waves they absorb. D) the dust particles are irregular in shape. E) ice particles reflect all light back toward their stars, not toward us.
A mass of 0.250 kg is attached to a spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the force constant of the spring?
A) 2.45 N/m B) 12.1 N/m C) 24.1 N/m D) 0.102 N/m E) 0.610 N/m
A convex mirror with focal length of –16.2 cm forms an image 11.7 cm behind the surface. Where is the object located as measured from the surface?
a. 22.2 cm b. 4.50 cm c. 6.79 cm d. 42.1 cm e. 11.7 cm