How heavy.......?

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Marvin can exert a force of 180 lbs. How heavy a rock can he lift if he uses a crowbar that is 5 ft. long and if he places the fulcrum so that it is 6 in. from the rock?

2007-01-12 06:34:59 · 3 answers · asked by kay 1 in Science & Mathematics ➔ Mathematics

3 answers

m - Mass (Weight).
F - Force.
d - Distance.

F1 x d1 = F2 x d2
F1 = (F2 x d2)/ d1
F1 = (180 x 4∙5)/ 0∙5
F1 = 1620 lbs.

2007-01-12 07:25:35 · answer #1 · answered by Brenmore 5 · 0⤊ 0⤋

If the fulcrom is .5 feet from the rock, and the crobar is 5 ft long, then the relationship is
ROCK * .5 = 180.* 4.5
or
ROCK = 180*4.5/.5 = 1620 pounds!

2007-01-12 06:40:33 · answer #2 · answered by firefly 6 · 0⤊ 0⤋

1620 lbs

2007-01-12 06:42:33 · answer #3 · answered by russiantoronto2003 2 · 0⤊ 0⤋