The answer is to this question D
        
                    
             
        
        
        
As momentum / time = force 
so; time = 100÷15
so your answer is 6.7 !!
        
             
        
        
        
Answer:
   t = 1.77 s
Explanation:
The equation of a traveling wave is
        y = A sin [2π (x /λ -t /T)]
where A is the oscillation amplitude, λ the wavelength and T the period
the speed of the wave is constant and is given by
       v = λ f
Where the frequency and period are related
      f = 1 / T
we substitute
       v = λ / T
let's develop the initial equation
     y = A sin [(2π / λ) x - (2π / T) t +Ф]
where Ф is a phase constant given by the initial conditions
the equation given in the problem is
     y = 5.26 sin (1.65 x - 4.64 t + 1.33)
if we compare the terms of the two equations
  
          2π /λ = 1.65
           λ = 2π / 1.65
           λ = 3.81 m
          2π / T = 4.64
           T = 2π / 4.64
           T = 1.35 s
we seek the speed of the wave
            v = 3.81 / 1.35
            v = 2.82 m / s
            
Since this speed is constant, we use the uniformly moving ratios
           v = d / t
            t = d / v
            t = 5 / 2.82
            t = 1.77 s
 
        
             
        
        
        
Explanation:
Let us assume that the separation of plate be equal to d and the area of plates is  . As the capacitance of capacitor is given as follows.
. As the capacitance of capacitor is given as follows.
             C = 
It is known that the dielectric strength of air is as follows.
                E = 
Expression for maximum potential difference is that the capacitor can with stand is as follows.
                        dV = E × d
And, maximum charge that can be placed on the capacitor is as follows.
                Q = CV
                    = 
                    = 
                    = 
                    = 
or,                = 10.62 nC
Thus, we can conclude that charge on capacitor is 10.62 nC.