When the equation H2O + NO2 ? NO + HNO3 is balanced, the sum of all the coefficients (both written and "understood") is ______________
Fill in the blank(s) with correct word
7 (coefficients in order are 1, 3, 1, 2)
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What is gravitational lensing?
A. the temporary disappearance of a star as an object passes in front of it B. the use of Earth's gravity to shape lenses during grinding C. the focusing and brightening of starlight by the gravitational field of a foreground object D. the use of small telescopes to enhance the brightness of stars
The ratio of the tensile fracture strength of ceramics to the compressive fracture strength is typically:
(a) 0.1 to 0.2 (b) 5 to 10 (c) 1 (d) 0.5
Phase Angles: A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the capacitance in this circuit?
A. 13 ?F B. 14 ?F C. 15 ?F D. 16 ?F E. 17 ?F
Radiation darkening explains why
A) there are so many dark craters on the jovian moons. B) Uranus' moons are darker than Saturn's. C) Earth's Moon is made of rock, but jovian moons are icy. D) Iapetus has a two-faced appearance.