an open system starts with 20,000 J of mechanical energy. The energy changes to 18,000 J of mechanical energy and 2,058 J of thermal energy. what is the final total energy of the system?

the temperature of the gas, in k, not celsius.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

a

the answer is c i took the test