A 90.0 kg mail bag hangs by a vertical rope 3.7 mm long. A postal worker then displaces the bag to a position 2.3 mm sideways from its original position, always keeping the rope taut.

(a) What horizontal force is necessary to hold the bag in the new position?

(b) As the bag is moved to this position, how much work is done

(i) by the rope and

(ii) by the worker?

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line