Which of the following situations results in zero work done? An applied force is parallel to the displacement on an object.

An applied force is anti-parallel (in the opposite direction) to the displacement on an object.

An applied force is perpendicular to the displacement of an object. An applied force is at some angle less than 90 degrees to the displacement of the object.

Which changes of state do the labels represent? a: b: c:

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp