Currently, electric motor powered fixed wing UASs are vehicles capable of carrying small payloads and are limited to an endurance of , at most, with the weight of the battery being the largest limiting factor.

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