PLEASE HELP ME WITH THIS ONE QUESTION A boiler does 1 kJ of work and then the heat of the exhaust is measured to be 100 J. What is the efficiency of the boiler?

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

The correct answer is c. hope this