In an ac circuit, if the peak value of the voltage is 100 V, what is the rms value?
A) 141 V
B) 100 V
C) 210 V
D) 71 V
E) 120 V
D
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We expect a scientific theory to be able to make predictions that can be tested. Which of the following is a prediction of the nebular theory that has been verified by observations?
a. Large planets should have at least some moons that are larger than the smallest planets. b. Planetary orbits should lie in approximately the same plane as the disk of the Milky Way Galaxy. c. Earth-size planets should have fairly large moons. d. Many stars should have planets.
A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
A. 1.2 × 1020 m/s2 B. 1.5 × 1020 m/s2 C. 1.0 × 1020 m/s2 D. 1.8 × 1020 m/s2 E. 2.0 × 1020 m/s2
When resistors are connected in parallel, we can be certain that
A) the same current flows in each one. B) the potential difference across each is the same. C) the power dissipated in each is the same. D) their equivalent resistance is greater than the resistance of any one of the individual resistances.
What technique often requires the use of a laser guide star?
a. active optics b. photometry c. adaptive optics d. comparison spectrum e. representational color imaging