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How did Rod S.Lakes prove photon mass in experiment at University of Wisconsen? If I get my bicep muscle surgically removed, will there be a scar afterwards? How can energy be created as the product of Power and time? If two straight lines are parallel, are their direction vectors equal? If the heat of combustion for compound X is -1490.0 kJ/mol and molar mass is 77.69 g/mol, how many g of this X releases 121.90 kJ of heat?