Reactive Current - Parallel RCL

[nix85]

Yes, book is in state of rest. How did you imagine to move it at constant speed without accelerating it while working against friction.

[lancaIV]

By typical average Earth velocity ? 


No,let us be serious :


-F/F Forces ( e /e-) movement is important because


Newton's law of gravitation resembles Coulomb's law of electrical forces, which is used to calculate the magnitude of the electrical force arising between two charged bodies. Both are inverse-square laws, where force is inversely proportional to the square of the distance between the bodies. Coulomb's law has the product of two charges in place of the product of the masses, and the Coulomb constant in place of the gravitational constant.




Newton's law has since been superseded by Albert Einstein's theory of general relativity, but it continues to be used as an excellent approximation of the effects of gravity in most applications. Relativity is required only when there is a need for extreme accuracy, or when dealing with very strong gravitational fields, such as those found near extremely massive and dense objects, or at small distances (such as Mercury's orbit around the Sun).

[nix85]

Of course, more unrelated stuff, but no admission that work is done on the book. Again, no surprises.

[lancaIV]

Of course, more unrelated stuff, but no admission that work is done on the book. Again, no surprises.

                                                                               If


                                             you move the book at constant speed horizontally,

                                                         you don't do any work on it,


                            despite the fact that you have to exert an upward force to counter-act gravity.




Work can only be done on an object if it moves, if the object moves up 2 meters and then it falls back down 2 meters and returns to it's original position then there was no work done on the block. If the distance from the starting position and the ending position does not change then there was no work done on the block. So to answer your question, no gravity has done no work on this object because it just fell back to it's original position.




                                                        book calculation vectors  :
                                           Pushing work and anti-pushing work not included

[nix85]

                                                                               If


                                             you move the book at constant speed horizontally,

                                                         you don't do any work on it,


                            despite the fact that you have to exert an upward force to counter-act gravity.

Let's ignore the fact that you need to accelerate the book first.

To move the book at constant speed you must constantly work against friction.

If we suppose book is sitting on imaginary frictionless table, then once pushed it would just keep moving, it would not require you to keep pushing it. So your proposition is nonsensical.