Answer:
correct is C
Explanation:
In this exercise we will use the rotational equilibrium relationships. Let's set the datum at the pivot point and counterclockwise rotations as positive
as the bar is uniform its center of mass coincides with its geometric center
x_{cm} = 0.25 cm
the distance from the fulcrum is
x₁ = 0.40 - xcm
x₁ = 0.40 - 0.25
x₁ = 0.15 m
Στ = 0
w_bar 0.15 - W x = 0
x = 0.15 w_bar / W
x = 0.15 m_{bar} / M
let's calculate
x = 0.15 0.2 /0.6
x = 0.05 m
this distance is measured from the pivot point of the positive side, if we measure from the left end of the bar
X = 0.4 + 0.05
X = 0.45 m = 45 cm
correct is C
