The elastic modulus in most materials _________as the temperature increases.
Fill in the blank(s) with the appropriate word(s).
decreases
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What is a superbubble?
A) a very low-density region of interstellar space, formed by the merger of supernova remnants B) a region filled with hot gas from a single supernova explosion C) It is another name for the large volume of space in the galaxy's halo. D) It is the roundish region cleared out by the expanding gas of a planetary nebula. E) a dense cloud of gas that can form many new stars
A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units):
angle of landing height = launch height. What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s
The battery is disconnected from a series RC circuit after the capacitor is fully charged and is replaced by an open switch. When the switch is closed,
A. the current through the resistor is always greater than the current through the capacitor. B. the current through the resistor is always less than the current through the capacitor. C. the current through the resistor is always equal to the current through the capacitor. D. the capacitor does not allow current to pass. E. the current stops in the resistor.
Two parallel conductors are carrying currents in the same direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 ?T. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. a value greater than 40 ?T b. 40 ?T c. a value less than 40 ?T d. It could be any value.