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If the load is 13 cm from the fulcrum, how much effort is needed to lifth the load ? Help me.
That depends on a few things that you haven't told us about the setup. So I'm going to assume one of them, and then give you the answer in terms of another one:
-- Assume a Class-I lever . . . the fulcrum is between the load and the effort.
-- Then the effort needed to lift the load is
(the weight of the load) x (13 / the distance between the fulcrum and the effort)
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