<h3>
Answer:  7.74 newtons</h3>
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Steps Shown:
Work = Force*Displacement
Power = Work/Time
Power = (Force*Displacement)/Time
900 W = (F*1000 m)/(8.6 sec)
900 = (F*1000)/8.6
900*8.6 = 1000F
7740 = 1000F
1000F = 7740
F = 7740/1000
F = 7.74 newtons
 
        
        
        
Answer:
 d_{b} = 2 d_{a}
Explanation:
The electrical resistance for a cylindrical wire is described by the expression
          R = ρ L / A
The area of a circle is
      A = π r²
      r = d / 2
      A = π d²/4
We substitute
       R = ρ L  4 /π d²
Let's apply this expression to our case, they indicate that the resistance of wire A is 4 times the resistance of wire B
      = 4 R_{b}
 = 4 R_{b}
We substitute
     ρ  4/π  ² = 4 (ρ  4/π d_{b}²)
² = 4 (ρ  4/π d_{b}²)
     1 / d_{a}² = 4 / d_{b}²
      d_{a} = d_{b} / 2
 
        
             
        
        
        
Answer:
The answer is 13 however make sure if they ask for a certain measurement like meter answer it by saying 13 meters.
Explanation:
This basically turns into basic algebra if you know the formula for work. The formula for work is W=F*d  
Here are the variables that you know 650J=50N*d so you need d.
All you do is divide 650J by 50N and you get a total of 13 (meters since I don't know what they want you to put it in).