What is the magnitude and phase of (1+w3)exp(-1x6)? ii) if a small source has a source level of 165 db re 1μρα, what is the spl at 50m from the source in an open space. give your answer in db re lupa,? i) what is the transmisson loss of a wave in a chamel of height 11: 0m over a horizontal range of 500m?

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.