Explanation:
Given that, 
2 strings both vibrate at exactly 220 Hz. The frequency of sound wave depends on the tension in the strings. 
The tension in one of them is then decreased sightly, then  will decrese.
 will decrese. 
Beat frequency, 

 
 
So, the new frequency of the string is 217 Hz. Hence, this is the required solution. 
 
        
             
        
        
        
Your kinetic energy goes down and your potential energy rises. This happens till you reach the top or start falling, in which the opposite happens. Hope this helps!
        
             
        
        
        
<span>The medium in which it travels through</span>
        
             
        
        
        
Answer:
Torque; τ = 4.712 × 10^(-3) J 
Magnetic moment; M = 0.0248 J/T
Explanation:
Torque is gotten from the formula;
τ = BIA
Where;
B is magnetic field
I is current
A is area
We are given;
B = 0.19T
I = 6.2A
Rectangle dimensions = 5cm by 8cm = 0.05m by 0.08m
Thus;
Area; A = 0.05m × 0.08m = 0.004 m²
Thus;
τ = 0.19 × 6.2 × 0.004
τ = 4.712 × 10^(-3) J
Formula for the magnetic moment is given by;
M = IA
M = 6.2 × 0.004
M = 0.0248 J/T
 
        
             
        
        
        
Explanation:
Formula depicting relation between total flux and total charge Q is as follows. 
                (Gauss's Law)
    (Gauss's Law)
Putting the given values into the above formula as follows.
             Q =  
 
                 = 
                 = 
                 = -8.4 nC
Therefore, when the unknown charge is q  then,
          -14.0 nC + 33.0 nC + q = -8.4 nC
                q = -27.4 nC
Thus, we can conclude that charge on the third object is -27.4 nC.