Speed or power activities
 
        
                    
             
        
        
        
Answer:
I think its the Blue wave, im not sure so dont take my word for it.
Explanation:
 
        
             
        
        
        
Answer:
437 Joules
Explanation:
Use the formula for work directly
(work) = (force) x (displacement) 
to get 
(work) = (19 N) x (23 m) = 437 Joules
 
        
             
        
        
        
Answer:
Explanation:
Let the equilibrium position of third charge be x distance from q₁. 
Force on third charge due to q₁
= 9 x 10⁹ x 5 x 10⁻⁹ x 15 x 10⁺⁹ / x²
Force on third charge due to q₂
= 9 x 10⁹ x 2 x 10⁻⁹ x 15 x 10⁺⁹ /( .40-x)²
Both the force will act in opposite direction and for balancing , they should be equal. 
9 x 10⁹ x 5 x 10⁻⁹ x 15 x 10⁺⁹ / x² = 9 x 10⁹ x 2 x 10⁻⁹ x 15 x 10⁺⁹ /( .40-x)²
5  / x² = 2 / ( .4 - x )²
Taking square root on both sides 
2.236 / x = 1.414 / .4 - x 
2.236 ( .4 - x ) = 1.414 x 
.8944 - 2.236 x = 1.414 x 
.8944 = 3.65 x 
x = .245 m 
24.5 cm 
So the third charge should be at a distance of 24.5 cm from q₁ .