Question

Problem 78

Answer 1

Given information

Given:

Mass of object B,   

 

Formula used:

Torque can be obtained by:

 

Here, r is the distance from the rotational axis and F is the applied force.

Step-by-step explanation

Step 1.

To solve this use the principle of net force and net torque is zero for a system in equilibrium.

Let one first consider the torque at point .

 

or  

Now balancing the forces acting on the bottom-most bar,

 

Where  is the upward force on the string holding the bottom-most bar.

or