A50-kg student gets in a 1000-kg elevator at rest. as the elevator begins to move, she has an apparent weight of 600 n for the first 3 s. how far has the elevator moved, and in which direction, at the end of 3 s?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

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

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2