Answer:
 x ’= 1,735 m,  measured from the far left 
Explanation:
For the system to be in equilibrium, the law of rotational equilibrium must be fulfilled.
Let's fix a reference system located at the point of rotation and that the anticlockwise rotations have been positive
              
They tell us that we have a mass (m1) on the left side and another mass (M2) on the right side,
the mass that is at the left end x = 1.2 m measured from the pivot point, the mass of the right side is at a distance x and the weight of the body that is located at the geometric center of the bar
            x_{cm} = 1.2 -1
           x_ {cm} = 0.2 m
           Σ τ = 0
           w₁ 1.2 + mg 0.2 - W₂ x = 0
           x =  
           x = 
let's calculate
           x =  2.9 1.2 + 4 0.2 / 8
2.9 1.2 + 4 0.2 / 8
            
           x = 0.535 m
measured from the pivot point
measured from the far left is
            x’= 1,2 + x
            x'=  1.2 + 0.535
            x ’= 1,735 m
 
        
             
        
        
        
1. It’s true 
4 ,7 ,8 is correct
        
             
        
        
        
Answer:
 .
. 
Explanation:
Let  denote the absolute temperature of this object.
 denote the absolute temperature of this object.
Calculate the value of  before and after heating:
 before and after heating:
 .
.
 .
.
By the Stefan-Boltzmann Law, the energy that this object emits (over all frequencies) would be proportional to  .
.
Ratio between the absolute temperature of this object before and after heating:
 .
. 
Therefore, by the Stefan-Boltzmann Law, the ratio between the energy that this object emits before and after heating would be:
 .
.
 
        
             
        
        
        
Answer:
<h2>14.52 J</h2>
Explanation:
The kinetic energy of an object can be found by using the formula

m is the mass
v is the velocity
From the question we have

We have the final answer as
<h3>14.52 J</h3>
Hope this helps you