Large fractures in Earth's surface that are associated with the movement of lithospheric plates are called ______________
a. canyons
b. trenches
c. subduction zones
d. faults
d
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Calculate the current through a 10.0-m long 22 gauge (having radius 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. The resistivity of nichrome is 100 × 10-8 ? ? m
A) 17.5 A B) 30.9 A C) 61.8 A D) 388 mA E) 776 mA
The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs. B) They do not support the conclusion that dark matter is the dominant form of matter in the universe. C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs. D) They tell us that dark matter was produced during the era of nuclei.
Which statement is always correct when applied to a charge distribution located in a finite region of space?
a. Electric potential is always zero at infinity. b. Electric potential is always zero at the origin. c. Electric potential is always zero at a boundary surface to a charge distribution. d. Electric potential is always infinite at a boundary surface to a charge distribution. e. The location where electric potential is zero may be chosen arbitrarily.
Which of the following materials has the largest conductivity (at 20°C)?
A) copper B) platinum C) silver D) iron E) glass