A 300-W electric heater is used in a 110-V circuit. The safety fuse in the circuit can accommodate 15 A of current. How many heaters can be safely operated in the circuit?
A. 5
B. 4
C. 3
D. 2
Answer: A
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____________________ contributes to the greenhouse effect by destroying plants that use carbon dioxide.
Fill in the blank(s) with the appropriate word(s).
Poorer nations are less vulnerable to the consequences of global warming.
Answer the following statement true (T) or false (F)
Today it is estimated that about ________ still survive by hunting and gathering rather than by agriculture
A) 5 million B) 2 million C) 750,000 D) 400,000 E) 250,000
If the earth's average surface temperature were to increase, the amount of radiation emitted from
the earth's surface would __________ and the wavelength of peak emission would shift toward __________ wavelengths. a. increase, shorter b. increase, longer c. decrease, shorter d. decrease, longer