The detection of physical energy emitted or reflected by physical objects is called

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o