The Prehistory of Jazz. The Africanization of American Music. An elderly black man sits astride a large cylindrical drum. Using his fingers and the edge of his hand, he jabs repeatedly at the drum head--which is around a foot in diameter and probably made from an animal skin--evoking a throbbing pulsation with rapid, sharp strokes.
nope, efficiency o fa machine cannot be greater than 100%...theoretically it shows sometime that efficiency of a machine can be 100%, but practically it cannot be possible as â¦ there is some loss of energy is always involved in different ways. Answer   In order for a machine to be 100% efficient, the amount of energy going into it has to be precisely equal to the energy the machine is putting out-with nothing lost.
In any machine as per conservation of energy the input and out put energies must be equal. But what we speak of efficiency of a machine is the ratio of the useful out put energy to the input energy. Naturally this will be less than the total out put energy.It follows efficiency is less than 100%. But we can try our best to reduce the unused energy (not used for our purpose)to be the minimum possible.n any machine as per conservation of energy the input and out put energies must be equal. But what we speak of efficiency of a machine is the ratio of the useful out put energy to the input energy. Naturally this will be less than the total out put energy.