To determine the location of his center of mass, a physics student lies on a lig

Question

To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.90 m apart, as indicated in the figure below. The left scale reads 291 N, and the right scale reads 151 N.

To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.90 m apart, as indicated in the figure below. The left scale reads 291 N, and the right scale reads 151 N. Find the student's mass. Find the distance from the student's head to his center of mass. Your response differs from the correct answer by more than 100%. m

Explanation / Answer

a) students weight = 291 + 151 = 422N
mass = 422/9.8 = 45.102kg
b) take moments at 291 end (head end?)

151N x 2.90m = 437.9N x L
L = 151 x2.90/437.9 = 1m.

So C of G is 1m from head end

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