Rocks that include silicon and oxygen as major components are called ________.
A. silicides
B. silicates
C. silicons
D. di-silicons
E. dioxides
Answer: B
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Einstein's famous equation E = mc2 is a statement of __________
Fill in the blank(s) with correct word
If an electromagnetic wave has components Ey = E0 sin(kx - ?t) and Bz = B0 sin(kx - ?t) , in what direction is it traveling?
A) +x B) +y C) -y D) +z E) -x
A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he approaches the police car? (Assume the velocity of sound in air is 343 m/s.)
a. 220 b. 448 c. 526 d. 552 e. 383
Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 mN b. 40 mN c. 69 mN d. 50 mN e. 20 mN