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.
Exercise 5: What is the efficiency of a machine that has work inputof 40 joules and work output of 35 joules? Exercise 6: Work output of a large machine in a factory is 89,000 joules, and its input is 102,000 joules. 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.