The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves
A) low temperature of the coals.
B) low conductivity of the coals.
C) mind over matter techniques.
Answer: B
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Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age more than people who stay behind on Earth. B) have more fun than people who stay behind on Earth. C) age less than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
The direction of polarization of an electromagnetic wave is taken by convention to be
A. the electric field direction.
B. the magnetic field direction.
C. the direction of 
D. perpendicular to the electric field direction.
E. None of these choices are correct.
The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -16 nC B) +16 nC C) -17 nC D) +17 nC
An air column, open at one end and closed at the other, is being designed so that its second lowest resonant frequency is 440 Hz. What should be the length of the column if the speed of sound in air is 340 m/s?
A) 0.386 m B) 0.772 m C) 1.16 m D) 0.193 m E) 0.580 m