Question

The electrical energy in a hairdryer changes to thermal and mechanical energy when you use it. This change demonstrates which of Newton’s laws?

the law of conservation of mass
the law of conservation of matter
the law of conservation of energy
the law of conservation of mass-energy

Answer 1

energy is not lost
the amount of electrical enegry = amount of mechanical + amount of thermal energy


'conserved' means kept , not lost.

Answer 2

so which one?

Answer 3

C/

Answer 4

yes