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.
It iscalculated by:Efficiency 100%Due to friction, the efficiency of a machine is always less than 100 percent. Solved Examples Example 1: Tamara rides her skateboard 1.5 meters up a ramp to aheight of 0.5 meters above the ground. Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. Section 14.3 Mechanical Advantage and Efficiency Efficiency Because some of the work input to a machine is used to overcomefriction, work output is always less than work input.