Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other
The upper sheet carries +5.00 µC/m2. The electric field midway between the sheets is 4.25 × 105 N/C pointing downward. What is the surface charge density on the lower sheet? (?0 = 8.85 × 10-12 C2/N ? m2)
What will be an ideal response?
Answer: -2.52 µC/m2
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In the equation A = B/C, the B and C are said to be _______________ proportional
a. directly b. inversely c. not d. exactly
When we glimpse the chromosphere at the start and end of totality, its color is:
A) green (the famous flash). B) yellow, like the photosphere below it. C) red, due to ionized hydrogen at lower pressure. D) blue, due to the ionization of nitrogen by the magnetic fields. E) white from the moonlight.
According to the figure below, approximately how many years ago did oxygen finally get to half its current abundance in Earth's atmosphere?
a. 3 billion years ago b. 1 billion years ago c. 0.6 billion years ago d. 0.25 billion years ago e. 0.1 billion years ago
The atomic bomb that was dropped on Nagasaki in 1945 killed 140,000 people, helping to end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosive
How much mass was converted to energy when this took place? (1000 tons ? 4.3 × 1012 J) (Incidentally, modern H-bombs have energy yields 1000 times as much!)