An automobile engine provides 559 Joules of work to push the pistons and generates 2148 Joules of heat that must be carried away by the cooling system. Calculate the change in the internal energy of the engine. E = ____ Joules

Here engine provide 559 jouls of work so system provides work so work is negative

work=-559 J

Again heat generated 2148 jouls so exothermic and heat also negative

heat =-2148 J

according to 1 st law of thermodynamics

change in internal energy=work+heat

 

    =-559-2148 J

   =-2707 J

Change in internal energy is-2707 J