12.33. The lever of a screw jack is 24 in. long. If the screw has six threads per inch, what is the ideal mechanical advantage? Ans. 904

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Chapter1: Units, Trigonometry. And Vectors
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need help solving 12.34

12.33. The lever of a screw jack is 24 in. long. If the
screw has six threads per inch, what is the ideal
Ans. 904
12.34. If the screw jack in Prob. 12.33 is 15 percent
efficient, what force is needed to lift 2000 lb?
mechanical advantage?
operate at 600 rev/min. What should be the di-
ameter of the motor pulley if the motor speed is
2000 rev/min?
Ans. 75.0 mm
Transcribed Image Text:12.33. The lever of a screw jack is 24 in. long. If the screw has six threads per inch, what is the ideal Ans. 904 12.34. If the screw jack in Prob. 12.33 is 15 percent efficient, what force is needed to lift 2000 lb? mechanical advantage? operate at 600 rev/min. What should be the di- ameter of the motor pulley if the motor speed is 2000 rev/min? Ans. 75.0 mm
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