A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1000 Hz. If the impedance of this circuit is 200 ?, what is the resistance of the resistor?
A) 100 ?
B) 184 ?
C) 200 ?
D) 552 ?
E) 579 ?
Answer: B
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Weight and g: Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of planet B?
A. r/
B. r
C. r
D. 4r
E. 2r
According to the Big Bang theory, why do we live in a universe that is made of almost entirely of matter rather than antimatter?
A) During the first 0.001 second after the Big Bang, particles and antiparticles were made in almost but not perfectly equal numbers. Everything was annihilated except the slight excess of matter particles. B) GUT theories predict that under the conditions that prevailed in the early universe, the normal laws of physics would have been suspended, so that only matter particles were created and no particles of antimatter. C) The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real. D) Einstein's famous equation E = mc2 tells us that energy can turn into matter but does not tell us that it can turn into antimatter.
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound in air is 340 m/s, what is the smallest size insect they can detect?