Bierbank

Sitting down at the end of an empty ale-bench is usually a bad idea because the bank could overturn immediately. In the figure below, what is the weight needed on point BB just enough to compensate a body weight of 75 kg75\text{ kg} on point A?A?

Details and Assumptions:

  • The mass of the wooden panel is m=12kg.m = 12 \,\text{kg}.
  • The length of the bench is l=2.2ml = 2.2 \, \text{m} and its overhang is 35cm35\,\text{cm} on each side.
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