A metal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. A uniform magnetic field of 2.0 mT is directed at an angle of 30° with the plane of the rotation. What is the magnitude of the potential difference between the two ends of the blade?
A. 5.5 mV
B. 6.4 mV
C. 3.2 mV
D. 11 mV
E. 13 mV
Answer: C
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Which of the following lists the outer planets in order of increasing mass?
A. Uranus, Neptune, Saturn, Jupiter B. Saturn, Jupiter, Uranus, Neptune C. Jupiter, Saturn, Uranus, Neptune D. Jupiter, Saturn, Neptune, Uranus
If we develop spacecraft that can take humans to nearby solar systems at a few percent of the speed of light, how long would it be before we could conceivably populate all habitable planets in the entire Milky Way?
A) a few hundred thousand years B) a few million years C) a few hundreds of millions of years D) a few billion years E) We could never colonize the galaxy unless we had ships that could travel very close to the speed of light.
Alternating current and voltage (AC), rather than direct current and voltage (DC), are used for domestic electrical power. The reason for this is based on one of the following physical principles. Which one?
A) When a current flows through a resistance, heat is generated. B) When a current flows through a wire, a magnetic field is created. C) When the number of magnetic field lines passing through a circuit changes, a voltage is generated in the circuit. D) When a current-carrying wire is placed in a magnetic field, it may experience a force if properly oriented. E) Opposite electric charges attract each other, and like charges repel each other.
Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table
If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin, how large is the charge on each coin? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) A) 2.6 ?C B) 26 ?C C) 6.7 ?C D) 5.2 ?C E) 52 ?C