Which of the following statements about work is not true? a) A force must be exerted on an object for work to be done.
b) When work is done, an object is displaced or moved by a force.
c) The object must be accelerating.
d) When work is done, at least part of the force must be in the same direction as
the displacement

In a system, when potential energy decreases, then entropy also decreases. true false

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

Which of these metals are magnetic?