An AM radio tuning circuit has a coil with an inductance of 4.00 mH and a capacitor set at 7.50 × 10^-6 mF. What frequency will it detect?
a. 1520 kHz
c. 550 kHz
b. 919 kHz
d. 750 kHz
B
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If the entire history of the Earth was scaled to a time line the length of a football field, human civilization would occupy what proportion of the field?
A) a sliver no thicker than a piece of paper B) a silver no thicker than an atom C) about a quarter of the field D) about a half of the field
A hot air balloon derives its lift from the property of fluids as stated by
A. Pascal's Principle. B. Archimedes' Principle. C. Bernoulli's Principle. D. Boyle's Law.
The first life to originate on Earth must be
A) at least as old as the oldest fossils B) exactly the same age as the oldest fossils C) younger than the oldest fossils D) much older than the oldest fossils
Which of the following could be a stable planetary orbit in a binary system?
A) a large orbit around both stars in a wide binary system B) an orbit close to one of the stars in a wide binary system C) a "figure-of-eight" orbit about both stars in a close binary system D) an orbit close to one of the stars in a close binary system