Series/Parallel Circuits: An ideal 100-V dc battery is applied across a series combination of four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ?. What is the potential difference across the 40-? resistor?
A. 20 V
B. 40 V
C. 60 V
D. 80 V
E. 100 V
Answer: A
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If you were to come back to Earth in 150 million year's time, what would a map of the planet look like compared to today?
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Linear momentum
a. has the units of mass times acceleration. b. has magnitude and direction. c. is a scalar quantity. d. none of these
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV
Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of about 4 million solar masses. C) It is a source of x-ray emission that we have observed with telescopes in space. D) It is a source of bright radio emission.