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Mathematics, 02.09.2020 20:01 Lydiaxqueen

28. Which of the following is true regarding the relationship between work and efficiency of a machine? a. Since work output is always less than work input, efficiency is always less than 100% b. Since friction increases work output, friction increases the efficiency of machines. C. Since work input and work output are always equal, efficiency is always 100% d. Since efficiency of a machine is determined by the ratio of work output to work input, the greater difference results in greater efficiency.

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