Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
11.1 nF, 17.7 C
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Fill in the blank(s) with the appropriate word(s).
Which of the following is the most basic definition of a greenhouse gas?
A) a gas that absorbs infrared light B) a gas that makes a planet much hotter than it would be otherwise, even in small amounts C) a gas that keeps warms air from rising, and therefore warms the surface D) a gas that reflects a lot of sunlight
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc/Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc/Vh of the volumes of the ideal gas. c. the ratio Pc/Ph of the pressures of the ideal gas. d. the ratio PcVc/PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.
Hurricanes can be generated
A) in tropical desert areas. B) from tropical storms with high levels of moisture and thermal energy. C) as moist thermal winds cross over the equator. D) by all of these.