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OpenStudy (kittiwitti1):

Three ppl attempt to haul a heavy sign to the roof on a building by using three ropes attached to the sign. Abby stands directly above the sign and pulls straight up on a rope. Eric and Kim stand on either side of Abby. Their ropes form 30.0 degree angles with Abby's rope. A force of 102 N is applied on each rope. What is the upward force acting on a sign? --- The given answer: 279 N

OpenStudy (kittiwitti1):

@AllTehMaffs |dw:1383485394638:dw|

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