The pilot of an airplane notes that the compass indicates a heading due west. the airplane's speed relative to the air is 130 km/h. the air is moving in a wind at 35.0 km/h toward the north. find the velocity of the airplane relative to the ground.

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