Why is the CMB so cool now?
A. Energy from the CMB was transformed into dark energy.
B. The expansion of the Universe has stretched the radiation to longer wavelengths.
C. Clouds of dust have blocked or scattered most of the radiation.
D. The radiation's energy drives the expansion of the Universe.
Answer: B
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When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ________.
A. expand and cool B. contract and heat C. contract and cool D. expand and heat
The source of electrons lighting common lamps in your classroom is
1) the power company, 2) the electrical outlet, 3) atoms in the lamp filament, 4) the wires leading to the lamp, whereas the source of energy that lights a common lamp in your home is 5) the power company. 6) the electrical outlet. 7) atoms in the bulb filament. 8) the wires leading to the lamp.
What charge appears on the plates of a 6.0-?F capacitor when it is charged to 40 V?
A) 60 ?C B) 120 ?C C) 180 ?C D) 240 ?C E) 350?C
Consider a 1.40 kW hair dryer operated on 120. V. What is (a) the current? (b) its resistance?
What will be an ideal response?