The following three appliances are connected to a 120-V house circuit: i) toaster, 1200 W, ii) coffee pot, 750 W, and iii) microwave, 1000 W. If all were operated at the same time, what total current would they draw?
a. 5.0 A
c. 23 A
b. 25 A
d. 6.0 A
B
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Polarization: As shown in the figure, the orientation of the transmission axis for each of three ideal polarizing sheets is labeled relative to the vertical direction. A beam of light, polarized in the vertical direction, is incident on the first polarizer with an intensity of 1.00 kW/m2. What is the intensity of the beam after it has passed through the three polarizing sheets when ?1 = 30°, ?2 = 30°, and ?3= 60°?
A. 141 W/m2 B. 316 W/m2 C. 433 W/m2 D. 563 W/m2 E. 188 W/m2
What do astronomers mean when they say the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Average distances are increasing between most galaxies. C) Average distances are increasing between most stars. D) The universe is expanding from a single point.
The number of waves passing the observer per second is:
A) the wavelength in angstroms. B) the amplitude in nm. C) the frequency in Hertz. D) the period in seconds. E) the energy in milliwatts.
Methane should be rapidly destroyed in Titan's atmosphere, yet it is still present in appreciable amounts. How can this be?
A) on the surface of Titan live cows that are constantly producing methane gas B) larger hydrocarbons like ethane and propane are being broken down by ultraviolet light into methane C) methane may be continually evaporating from the surface and the interior D) comet impacts are constantly supplying the atmosphere with fresh methane