Consider an infinite pipe that conducts current along its length. The magnetic field that this pipe creates is
A. unidirectional.
B. circular.
C. axial.
D. None of the above.
B. circular.
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A shift in the position of an emission line of an element toward the red or blue is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s. The two cars collide at the intersection and lock together
Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
If all the "dark matter" in our universe were to be instantaneously removed, which of the following would not happen?
A) The Milky Way would fly apart. B) Clusters of galaxies would fly apart. C) The universe would expand forever. D) The Solar System would fly apart. E) All of the above
A computer accessory salesman attempts to convince you to purchase a "solar neutrino" shield for your new computer. (It's even "on sale"!) Why do you turn down this excellent offer?
A) Neutrinos rarely, if ever, interact with your computer. B) The Earth's natural magnetic field already offers excellent protection against the onslaught of solar neutrinos. C) Solar neutrinos are generated by solar winds, but we're in a solar minimum now, so the risk of damage is very low. D) There's no such thing as a solar neutrino.