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A wooden plant of negligible weight and 80cm long is supported by a knife edge at P. Weights of 2N, 4N and F act as shown. Calculate the value of F

Answer Text:
Anticlockwise moments = Clockwise moments
4N x 0.5m = 0.1F + 2 x 0.7
2 = 0.1F + 1.4
F = #0.6/0.1#
F = 6N