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Which of the following is true about the universe?

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in Engineering Physics I by (558k points)
Which of the following is true about the universe?

(a) It is an open system

(b) It is a closed system

(c) It is an isolated system

(d) It is an international system

The question was posed to me during an interview.

My question is taken from Laws Governing Gravity in portion Laws of Motion of Engineering Physics I

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Right option is (c) It is an isolated system

The explanation: In spite of all the violent phenomenon occurring in this universe all the time, the total energy if the universe remains constant. The total energy remains constant only in an isolated system. Thus the universe is an example of an isolated system.

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