Which of the following statements best describes the concept of entropy?
A) Energy has a tendency to disperse.
B) Energy is neither created nor destroyed.
C) The entropy of the universe is constantly decreasing.
D) The energy released in a chemical reaction is the same as the difference in the energy of the bonds broken and formed.
E) Energy has a tendency to remain in one place.
Answer: A
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How can meteorites from the Moon or Mars have made it to Earth?
A) Impacts on those worlds blasted rocks into space that eventually fell to Earth. B) Those worlds spin rapidly enough to have sent some rocks from their surfaces into space. C) The meteorites from the Moon and Mars were never actually part of those worlds; they are just rocks that formed in the same vicinities of the solar system. D) The solar wind gradually blew material off of the surfaces of these worlds, and once in space it collected together to make the meteorites.
Glass panes are opaque to a certain type of radiation, which passes through quartz. What type of radiation is it? This radiation is important in ozone layer reactions
a. microwave b. gamma c. x-ray d. ultraviolet
A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire
A) 0.75 N B) 1.5 N C) 3.0 N D) 6.0 N
A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. The field out of the paper decreases to 0.02 T in 12 milliseconds
(a) What is the magnitude of the change in magnetic flux enclosed by the coil? (b) What is the average voltage induced in the coil as the flux is changing? (c) If the coil has a resistance of 4.0 ohms, what is the magnitude of the current in the coil?