Answer:
A puck hovers and glides across an air track at constant velocity is the scenario where a non-conservative force acts(air friction)
Explanation:
Conservative forces are the forces which are path-independent.
so, total work done by conservative forces in a closed loop is zero
Now, non-conservative forces are path-dependent forces.
These are dissipative forces in nature, so total work done by non-conservative forces is not zero.
Option a) A puck hovers and glides across an air track at constant velocity.
Even though puck moves with constant velocity there will air drag force which is friction and non-conservative in nature. so, to keep puck to move with constant velocity we need to compensate this friction.
Option b) A dishwasher was pulled up to a window by a rope using a pulley system.
Here, work is done against gravitational force which is conservative in nature.
Option c) A feather falls from one end of a tube to the other inside a vacuum.
Here, there are no forces. feather just moves in vacuum, so, the work done is also zero.
Option d) A charged particle was pushed away by another charged particle.
here, these are forces generated by electric charges, which are similar to gravitational force. so, these are also conservative forces.
