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### Mechanical Comprehension

 81 Answer B is correct. According to the formula, MA=Resistance/Effort, or MA=240/60; MA=4. Answer A assumes that MA=RE; Answer C assumes that MA=E/R; Answer D assumes that there is no mechanical advantage. Therefore, answers A, C, and D are incorrect. 82 Answer D is correct. A 5 hp engine can do 165,000 ft_lb of work per minute, because 60(5 x 550)=165,000. Answers A and B indicate an incorrect rate, and answer C indicates the amount of work output per second; therefore, answers A, B, and C are incorrect. 83 Answer B is correct. According to the formula wd=wd, then 4x=500; x=125. Answer A assumes a mechanical advantage of only 2, which is incorrect. Answer C assumes no mechanical advantage, which is also incorrect. Because ...

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