A pulley system can be used to raise a load.A pulley system is used to raise a load of 80N at a speed of 0.15ms-1 by means of a constant effort of 30NFor every metre the load rises the effort acts over a distance of 3 metres.
The effort must therefore act at a speed of 0.45ms-1.The work done per second by the effort is 30×0.45=13.5W. The work done per second on the load is 80×0.15=12WThe difference is the energy wasted each second.
The effort must therefore act at a speed of 0.45ms-1.The work done per second by the effort is 30×0.45=13.5W. The work done per second on the load is 80×0.15=12WThe difference is the energy wasted each second.