The largest contributor to the global warming problem is
A) fossil fuels.
B) chlorofluorocarbons.
C) landfills and trash incinerators.
D) land-use modification, such as cutting down the tropical rain forests.
E) the nuclear power industry.
A
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Global temperature variations on Earth driven by the Milankovitch cycle differ from those driven by the anthropogenic greenhouse effect in that
a. they are very small in magnitude, less than 1°C. b. they occur at irregular time intervals. c. they are driven by volcanic activity. d. they occur over much longer time scales (thousands of years). e. they are driven by emissions of methane gas rather than carbon dioxide.
Suppose that 
both have nonzero y and z components, but both also have zero x components. Which components of 
are nonzero? Select or indicate all the letters that apply.
A. 
is nonzero.
B. 
is nonzero.
C. 
is nonzero.
A 120-V rms signal at 60.0 Hz is applied across a 30.0-mH inductor and a 100-? resistor. What is the rms value of the voltage across the resistor?
A) 119 V B) 60.0 V C) 100 V D) 110 V E) 0.700 V
A coaxial cable consists of a long, straight filament surrounded by a long, coaxial, cylindrical conducting shell. Assume charge Q is on the filament, zero net charge is on the shell, and the electric field is E1î at a particular point P midway between the filament and the inner surface of the shell. Next, you place the cable into a uniform external field –Eî. What is the x component of the
electric field at P then? 1. 0 2. between 0 and E1 3. E1 4. between 0 and -E1 5. - E1