Carbon has a negative temperature coefficient of resistance of –0.5 × 10^–3 (°C)?1 . What temperature increase would result in a resistance decrease of 1.0% for a carbon resistor?
a. 2.0°C
b. 20°C
c. 20°C
d. 50°C
e. 100°C
b
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The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago. B) a thousand years ago. C) tens of thousands of years ago. D) hundreds of thousands of years ago. E) a million years ago.
In former times, most beverage containers were refillable
What will be an ideal response?
Stalactites form from
A) a cave ceiling downward. B) a cave floor upward. C) calcium-rich water dripping down from the cave ceiling. D) the accumulation of calcium-rich water dripping on the cave floor.
Vision Problems: What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A. -2.5 diopters B. +20 diopters C. +0.20 diopters D. +2.5 diopters E. +2.7 diopters