When current is flowing in a superconductor, which statement is not true?
a. A battery is needed to keep the current going.
b. Electrical charges are moving.
c. The resistance is zero.
d. No power is given off in the form of heat.
a
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A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A) -4.1 cm B) +20 cm C) -9.9 cm D) -20 cm E) +9.9 cm
How do the escape velocities for two rockets, the first weighing 20 N and the second weighing 20,000 N compare?
A) The escape velocity for the lighter rocket is smaller than that for the heavier rocket. B) The escape velocity for the lighter rocket is the same as that for the heavier rocket. C) The escape velocity for the lighter rocket is greater than that for the heavier rocket. D) It is impossible to compare the two escape velocities.
An ideal monatomic gas cools from 455.0 K to 405.0 K at constant volume as 831 J of energy is removed from it. How many moles of gas are in the sample? The ideal gas constant is R = 8.314 J/mol ? K
A) 2.50 mol B) 2.15 mol C) 1.50 mol D) 1.33 mol E) 0.725 mol
What was the Shoemaker-Levy 9 impact?
A) the 1994 impact of a chain of comet fragments into Jupiter B) the impact thought to have wiped out the dinosaurs C) the impact that created the Moon's largest crater D) the ninth impact witnessed by astronomers in modern times