Which of these is the law of conservation of energy? A. The total kinetic energy in any closed system is constant. B. The total mechanical energy in any closed system is constant if there is no friction acting. C. The total energy in any closed system is constant. D. Momentum is always conserved, but kinetic energy is not necessarily conserved.

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Which of these is the law of conservation of energy? A. The total kinetic energy in any closed system is constant. B. The total mechanical energy in any closed system is constant if there is no friction acting. C. The total energy in any closed system is constant. D. Momentum is always conserved, but kinetic energy is not necessarily conserved.

Physics
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I'm pondering...
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a closed system is a system which is able to exchange only energy with the surrounding environment.

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Other answers:

so our solution is option C?
no, since the energy can change, inside a closed system
ohh i am not sure then... choice D ? :/
that's right!
yay! thank you!
:)

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