When the distance between a pair of charged particles is doubled, the force between them becomes how strong?
Answer: one quarter as strong
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Which of the following statements correctly describes the law of conservation of energy?
A) An object always has the same amount of energy. B) Energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed. C) Energy can change between many different forms, such as potential, kinetic, and thermal, but the total quantity of energy in the universe never changes. D) The fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy. E) It is not really possible for an object to gain or lose potential energy because energy cannot be destroyed.
The basic building blocks of matter are protons, neutrons, and electrons
Indicate whether the statement is true or false
The cosmological principle is the ultimate extension of the Copernican principle to the entire universe, in that there is no center at all
Indicate whether the statement is true or false
If a two–body collision is not head–on, then we may always assume that:
a. momentum is conserved. b. kinetic energy is conserved. c. neither momentum nor kinetic energy are conserved. d. both momentum and kinetic energy are conserved.