A 1.0-µF capacitor and a 2.0-µF capacitor are connected together, and then that combination is connected across a 3.0-V potential source (a battery)
What is the potential difference across the 2.0-µF capacitor if the capacitors are connected (a) in series or (b) in parallel?
(a) 1.0 V (b) 3.0 V
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Heliocentric Solar System model
A. Solar Eclipses |
B. Alpha Centauri |
C. Proxima Centauri |
D. Lunar Eclipses |
E. Nicolas Copernicus |
F. Claudius Ptolemy |
A solar eclipse that occurs when the Moon's umbra does not reach Earth's surface is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral solar eclipse. e. an umbral solar eclipse.
This sequence of paintings shows how a large gas cloud can collapse to become a much smaller, spinning disk of gas. What law explains why the center of the cloud becomes so much hotter as the cloud shrinks in size?
A) the law of conservation of energy B) the universal law of gravitation C) the law of conservation of angular momentum D) Newton's second law of motion
For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 320 nm B) 340 nm C) 330 nm D) 350 nm