How much time did it take Alex to move a stack of books if he did 1600 J of work and used 40 W of power?

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

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