Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it
B) the wavelengths of light from a star are shifted as it moves about its center of mass
C) a planet passes in front of its parent star and blocks part of its light
D) a massive object accelerates another object that passes close to it
A
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Power is the rate at which
A) energy is transferred. B) voltage can be changed. C) current can be induced.
Complete the following sentence: "The moment of inertia of an object
1.depends on the rotational speed of the object." 2.will be greater for a larger-massed object than for a smaller-massed object." 3.is not a function of the object's mass." 4.is a function of the axis about which the object is spun."
A nearsighted person has a far point that is 4.2 m from his eyes. What power contact lenses must he wear to allow him to focus on distant mountains?
A) 0.24 diopters B) -0.36 diopters C) -0.48 diopters D) -0.24 diopters E) 0.48 diopters
Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?