The mer of butyl rubber has no carbon-carbon double bonds; therefore, its molecules cannot be _________with sulfur.
Fill in the blank(s) with the appropriate word(s).
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Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.
A certain engine extracts 1300 J of heat from a hot temperature reservoir and discharges 700 J of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 46% B) 54% C) 86% D) 27% E) 13%
What happens during the apparent retrograde motion of a planet?
A) The planet rises in the west and sets in the east. B) The planet appears to move westward with respect to the stars over a period of weeks to months. C) The planet moves backward through the sky over the course of a night. D) The planet moves backward in its orbit around the Sun. E) The planet moves through constellations that are not part of the zodiac.
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT