Consider the segment of cylindrical metal wire shown below. Assume that the drift speed of electrons is everywhere the same in the segment. Note that area B is tilted so that its nose vector makes an angle of ? < 90° with the drift velocity direction but still spans the wire’s entire cross section. How do the current density fluxes through areas A and B compare?
A. The flux through A is greater than the flux through B.
B. The flux through B is greater than the flux through A.
C. The fluxes through A and B are the same.
C. The fluxes through A and B are the same.
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A mole of iron has about half the mass of a mole of silver. Which likely has the greater heat capacity?
A. Iron B. Silver C. Both will have about the same heat capacity. D. One cannot say without measuring.
A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat
A) moves in the direction of the wind impact force. B) does not move by this wind impact. C) moves, but in the opposite direction of the wind impact force.
Estimate the thickness of a piece of paper
A) 10-4 meter B) 10-5 meter C) 10-6 meter D) 10-7 meter E) 10-8 meter
Legend says that Archimedes, in determining whether or not the king's crown was made of pure gold, measured its volume by the water displacement method. If the density of gold is 19.3 g/cm3, and the crown's mass is 440 g, what volume would be necessary to prove that it is pure gold?
a. 31.1 cm3 c. 22.8 cm3 b. 114 × 10^3 cm3 d. 1.81 × 10^-2 cm3