The internal resistances of an ideal voltmeter and an ideal ammeter are, respectively (ideal meaning the behavior of the system is not changed when using the meter):
a. zero and infinite.
c. zero and zero.
b. infinite and zero.
d. infinite and infinite.
B
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Momentum: A satellite, initially at rest in deep space, separates into two pieces, which move away from each other. One piece has a mass of 190 kg and moves away with a speed 0.500c, and the second piece has a mass of 250 kg and moves in the opposite direction. What is the speed of the second piece?
A. 0.212c B. 0.380c C. 0.402c D. 0.473c E. 0.500c
Contrast the brightest stars of young open and old globular clusters
What will be an ideal response?
The Hubble Space Telescope objective mirror is not affected by
a. bad seeing. b. chromatic aberration. c. diffraction. d. chromatic aberration and diffraction. e. bad seeing and chromatic aberration.
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.