A 4000-? resistor is connected across a 220-V power source. What current will flow through the resistor?
A) 0.055 A
B) 1.8 A
C) 5.5 A
D) 18 A
A
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Which system has the smallest total mass?
A. System A B. System B C. System C D. Systems A and B (which have equal total masses) E. Systems A and C (which have equal total masses) F. Systems B and C (which have equal total masses) T. All three systems have the same total mass.
What is the effective (rms) current value for an AC current with an amplitude of 15.4 A?
a. 15.4 A b. 7.70 A c. 10.9 A d. 3.92 A e. 2.77 A
Thin Films: A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?
A. 100 nm B. 200 nm C. 300 nm D. 400 nm E. 500 nm
An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move
a. counter clockwise around the celestial pole. b. clockwise around the celestial pole. c. from left to right. d. from right to left. e. nearly vertically upward.