In which situations is work being done? (I put the choices below, also I need more than one answer)
1. Hannah leans against her locker, but it doesn't move
2. Andy's car rolls down a hill with the engine off
3. A wind turbine stands still on a sunny, windless day
4. A balloon expands as its heated by the sun
5. James pedals a stationary exercise cycle that doesn't move

2 Andy's car rolls down a hill with the engine off

Explanation:

work is said to be done whenever a force moves a body a distance in the direction of the force note stationary object don't move so no distance is covered.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

yes

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