The mass of object b will be 1.5kg.
As a twisting or turning force, torque frequently causes objects to rotate around an axis, which could be the center of mass or a fixed point. Another way to think of torque is the capacity of something rotating, such as a shaft or gear, to overcome turning resistance.
Balancing torque for lower end
m x 2 = [tex]m_{A}[/tex] x 1
m = 1x1/2
m = 0.5kg
for middle one
(mA + m) x 2 = [tex]m_{0}[/tex] x 1
[tex]m_{0}[/tex] = (0.5+1) × 2
[tex]m_{0}[/tex] = 3.0kg
for upper end
[tex]m_{B}[/tex] x 3 = ([tex]m_{A}[/tex]+m+[tex]m_{0}[/tex]) x 1
[tex]m_{B}[/tex] x 3 = (1+0.5+3)
[tex]m_{B}[/tex] x 3 = 4.5
[tex]m_{B}[/tex] = 4.5/3
[tex]m_{B}[/tex] = 1.5kg.
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