Pumped storage generally will enable a utility to _______
a. increase the efficiency of their electrical generating system
b. store energy until the demand is high enough
c. raise electrons to higher energy states
d. increase their electrical potential energy
b
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Assuming that xenon (atomic number 54) and krypton (atomic number 36) have the same temperature and pressure, in which gaseous medium does sound travel faster?
A) Xenon B) Krypton C) a mixture of both D) the same in both
A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of the 3.0-kg object before the collisions?
A. 15 m/s B. 10 m/s C. 5.0 m/s D. 20 m/s E. 25 m/s
The ratio of the tensile fracture strength of ceramics to the compressive fracture strength is typically:
(a) 0.1 to 0.2 (b) 5 to 10 (c) 1 (d) 0.5
An aurora borealis high above the atmosphere is due to
A) disturbances in Earth's magnetic field. B) fountains of high-speed charged particles. C) trapping of charged particles by Earth's magnetic field. D) all of the above