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What would you describe defying physics in your definition? Calculate ΔE for the combustion of a gas that releases 215 kJ of energy to its surroundings and does 78.5 kJ of work on its surroundings.? What difference does the number of blades on a countersink drill bit make? How do I eliminate the parameter in these problems? Calculus question ! I am struggling to find the equation. Help Please !?