A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x, t) = sm cos (kx - wt). Its velocity can be obtained from
a. w/k
b. k/w
c. k
d. w
e. wk
A
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A 500-N weight sits on the small piston of a hydraulic machine. The small piston has area 2.0 cm2. If the large piston has area 40 cm2, how much weight can the large piston support?
A) 25 N B) 500 N C) 1000 N D) 10000 N E) 40000 N
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m
Which of these is/are not true of nuclear fission reactors?
a. Their intended output is heat. b. They produce the majority of the electric energy used in the world. c. There is a small chance one could explode like an atom bomb. d. Some can produce or "breed" more nuclear fuel than they consume.
Which of the following statements about comets and asteroids is true?
A) All asteroids lie in the asteroid belt between Mars and Jupiter. B) Only asteroids collide with Earth. C) There are about 1 million known asteroids in the solar system. D) Most of the trillions of comets in our solar system have tails. E) Comets are balls of ice and dust.