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Brad spends four hours watching football on television and does 1090 J of work. In the process, his internal energy decreases by 2990 J. Determine

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Brad spends four hours watching football on television and does 1090 J of work. In the process, his internal energy decreases by 2990 J. Determine the value of O, including the algebraic sign. (a) -1900 J (b) +1900 J (c) -2990 J (d) +4080 J ( A ) -4080 J

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