Chapter 12, Problem 21E

Figure 12.15 shows how a scale with a capacity of only 250 N can be used to weigh a heavier person. The 3.4-kg board is 3.0 m long and has uniform density. It’s free to pivot about the end farthest from the scale. Assume that the beam remains essentially horizontal. What’s the weight of a person standing 1.2 m from the pivot end if the scale reads 210 N?

FIGURE 12.15 Exercises 21