Fuel cells electrochemically combine ____ with hydrogen to produce electricity.
A. oxygen from the air
B. protons
C. graphite paper
D. a polymer membrane
Answer: A
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Bacteria in hydrothermal vent communities deep in the ocean use which process to gain energy?
a. chemosynthesis c. photosynthesis b. primary production d. nitrification
One of the major applications of electrical energy is the production of ____ energy, such as with solenoids.
a. mechanical b. potential c. kinetic d. chemical
Carry the answer to two decimal places. Six hundred twenty-five watertight screw connectors are purchased for $0.1725 each. Find the total cost.
Fill in the blank(s) with the appropriate word(s).
The ____ is shorthand for the home directory, which typically has the same name as the user's account name.
A. backward slash (\) B. forward slash (/) C. dollar sign ($) D. tilde (~)