Question

Which of the following is an example of the first law of thermodynamics?


Wind energy moves the paddle on a windmill. The paddles cause a turbine to move and this allows a generator to produce electricity.

The moving water in a waterfall has kinetic energy.

The stored energy in fossil fuels is potential energy.

A fossil fuel containing 1,000 J of energy is burned. 880 J of energy are captured from this burning.

Answer 1

The stored energy in fossil fuels is potential energy.

Answer 2

ty

Answer 3

i am about 85% sure

Answer 4

The last statement is definitely the second law.

Answer 5

thanks again

Answer 6

1st law: energy can be transformed, i.e. changed from one form to another, but cannot be created or destroyed

so 1 is the correct answer as energy is being converted from 1 form to another.

Answer 7

the first law
\[∂U= ∂Q-∂W\]
It is a law about internal energy or potential energy. the first statement about wind turning turbines and making electrons move, the internal energy is not changing, mechanical energy is propagating mechanical energy.

the statement about fossil-fules having potential energy , energy that can be released to perform useful work. makes more use of the first law