Yes. The work is being done by whoever is pushing rather then the engine, but work is being done. Any time a force is applied through a distance, work is being done.
Of corse,potential energy of pencil is increased.Therefor work done
Work = force x distance. If distance = 0, work = 0 because force x 0 = 0.
Well. Work is being done. While sitting down, the person does not apply any force. He lets himself be dragged down by gravity. During this process, the gravitational force is doing the work. The work done by the gravitational force is stored as the potential energy present in the compressed cushion.
Power. It is usually measured in Watts (or horse-power in vehicles).
If work is done on the system then it has a negative sign. If work is done by the system then it has a positive sign.
work is being done when you use energy
Yes. The work is being done by whoever is pushing rather then the engine, but work is being done. Any time a force is applied through a distance, work is being done.
No, work is only done on an object when there is displacement in the direction of the force applied. If the object does not move, then no work is being done on it.
In those days artists did not sign their work as it was done for the glory of God, to sign it would have been seen as an act of sinful vanity.
An example of work being done on an object is when a painter paints a canvas. The canvas is the object on which the work of painting is being done. The action of applying paint to the canvas is the work being performed on the object.
work can only be done by a living being
It is work that is being done in a laboratory.
Yes it is.
First, there are certain sign conventions. It could be defined in a different way, but things are traditionally done in a certain way. Second, if work going out of the system is defined as positive, then it is quite logical that work going into a system should have the opposite sign.
you know when work is done when it's finished and checked and approved by someone.
Yes it is being done, if the person doing it is doing it as part of a paid job or because they run a business and the letter is needed for the business. If it is being typed for school it may also be considered work, but of a different kind. And from the view of physics, since energy is being expended by the person typing, and perhaps by the machinery being used, work is being done. However, if you are at work and typing a letter to your grandmother, that is not the kind of work you are being paid for and your employer would say work is not being done.