A 9.0-V battery moves 200 mC of charge through a circuit running from its positive terminal to its negative terminal. How much energy was delivered to the circuit?
a. 4.5 x 103 J
c. 2.2 mJ
b. 1.8 J
d. 0.18 J
B
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A. In the x or y direction, but not both B. In both the x and y directions C. In the y direction only D. In the x direction only
What is one reason that early life formed cells?
A) cell walls prevent heat from escaping B) cells concentrate molecules together so they react more easily C) only cells can replicate D) biological reactions can occur only within cells
The nucleus of an atom is composed of protons and neutron held together by the
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The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle ? above the floor. d. pushed by a force directed at an angle ? into the floor. e. turned on its side and pushed by a force parallel to the floor.