When a particular inductor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled?
1.12.0 A
2.6.00 A
3.4.24 A
4.3.00 A
5.1.50 A
5
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Faraday's Law: A circular coil of 20 turns and radius 5.0 cm is placed with its plane oriented at 90° to a uniform magnetic field of 0.10 T. The field is now increased at a steady rate, reaching a value of 0.50 T after 4.0 seconds. What emf is induced in the coil?
A. 0.016 V B. 0.021 V C. 0.026 V D. 0.031 V E. 0.036 V
What is Charon?
A) Pluto's largest moon B) the largest known asteroid C) the largest known comet D) one of the Galilean moons of Jupiter E) a moon of Neptune
Two strings are respectively 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
a. 0.800, 0.670, 0.500 b. 1.33, 1.00, 0.500 c. 2.00, 1.00, 0.500 d. 2.00, 1.33, 1.00 e. 4.00, 2.00, 1.00
What is the oxidant?
In one type of fuel cell, the following oxidation-reduction reactions are taking place: 2 H2 + O2 ? 2 H2O A) H2 B) O2 C) H2O D) all of the above E) none of the above