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.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

the right answer is c i just did the question.