The term observable universe refers to
A) the portion of the universe that we have so far photographed through telescopes.
B) the portion of the universe that can be seen by the naked eye.
C) the portion of the universe that is not hidden from view by, for example, being below the horizon.
D) the portion of the universe that we can see in principle, given the current age of the universe.
D) the portion of the universe that we can see in principle, given the current age of the universe.
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Elementary Particles: Which of the following particles are leptons? (There may be more than one correct choice.)
A. protons B. neutrons C. electrons D. photons E. quarks
A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60-mF capacitor. If the final potential difference across the 60-mF capacitor is 40 V, determine C
a. 49 mF b. 32 mF c. 40 mF d. 90 mF e. 16 mF
Once there was a highly intelligent turkey that had nothing to do but reflect on the world's regularities. Morning always started out with the sky turning light, followed by the master's footsteps, which were always followed by the appearance of food. Other things varied, but food always followed footsteps. The sequence of events was so predictable that it eventually became the basis of the
turkey's theory about the goodness of the world. One morning, after more than 100 confirmations of the goodness theory, the turkey listened for the master's footsteps, heard them, and had its head chopped off. Any scientific theory is modified or discarded upon discovery of contradictory evidence. The absence of absolute certainty has led some people to conclude that "facts are irrelevant—facts change.". If that is so, should we stop doing scientific research? Why or why not? What will be an ideal response?
A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
a. 55 mV b. 46 mV c. 50 mV d. 60 mV e. 35 mV