Color TV is produced by
A) cyan, magenta, and yellow beams of electrons merging at the screen.
B) red, green, and blue beams of electrons merging at the screen.
C) A single beam of electrons striking a triad of phosphors of red, green, and blue.
D) A single beam of electrons striking a triad of phosphors of cyan, magenta, and yellow.
C
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Blocks A and B of masses 14 kg and 15 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force Q equals zero. The force P, for which block B is on the verge of moving, is closest to: A) 200 N B) 540 N C) 310 N D) 1,200 N E) 400 N
Suspend your body from a pair of ropes slightly angled from the vertical and the tension in each rope will be
A) equal your weight. B) half your weight. C) greater than half your weight. D) none of these
Spectral Series: To which of the following values of n does the longest wavelength in the Balmer series correspond?
A. 3 B. 5 C. 1 D. 7 E. ? (very large)
Which of the following statements best describes one astronomical unit (AU)?
A) It is the distance from Earth to the Moon. B) It is equal to the average distance of the Sun from Earth. C) It is the distance that light travels in a vacuum in one year. D) It is the average distance between two stars in the Milky Way.