What's the sequence of a single complete engine cycle?

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

2) why do satelites not fall while revolving around the earth?

Three resistance 4,4 and 6 ohms are joined in the series.the total resistance will be