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5 March, 22:03

A particular lever can lift a load with 80 percent efficiency. If 40 N of effort is applied 2.5 meters from the fulcrum, then what is the maximum load that can be lifted 1.5 m from the fulcrum?

A) 5333 N

B) 1920 N

C) 66.7 N

D) 53.3 N

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Answers (1)
  1. 5 March, 23:01
    0
    Refer to the diagram shown below.

    For dynamic balance,

    1.5W - 2.5F = 0

    W = (2.5*F) / 1.5

    = (2.5*40) / 1.5

    = 66.667 N

    Because the lever is 80% efficient, the actual maximum load that can be lifted is

    0.8*66.667 = 53.3 N

    Answer: D. 53.3 N
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