A machine converts 40% of electrical energy into mechanical energy and 60% into heat energy. What statement explains the law of conservation of energy? a. Machines always convert only a part of electrical energy to another form of energy.

b. Electrical energy always produces heat energy.

c. The machine changes the form of the electrical energy but cannot create or destroy energy.

d. Electrical energy is always accompanied by mechanical energy.

explanation:

newton's third law, for every action there is an equal and opposite reaction.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.