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.
Machine Efficiency= Work done by a machine on a load divided by work done on a machine by an effort force. multiply that by 100%. Work(J)=force(N)multiplied by Distance(m). The answer above is correct but not much use for a practical situation such as a motor driving a pump or a compressor being driven by a turbine. The number of calculations in this subject is vast.