Answer:
Frequency – The frequency of a wave is the number of waves that pass a given point in a certain amount of time. Frequency is measured in units called hertz (Hz), and is defined as the number of waves per second. A wave that occurs every second has a frequency of 1 wave per second (1/s) or 1 Hz.
 
        
             
        
        
        
Answer:
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Explanation:
 
        
             
        
        
        
Answer:
Give the child a lot of room to your side, which may mean moving closer to the oncoming vehicles.
Explanation:
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Answer:
 -2.33 m/s²
Explanation:
The computation of the skateboarder’s acceleration is shown below;
Acceleration means the change in velocity per unit with respect to time. 
In the given case, the initial velocity is 7 m/s. 
As in the question it is mentioned that  it comes to a stop, so the final velocity would be zero. 
And, The time elapsed is 3 seconds. 
Now the following equation should be used  
a = (v,final - v,initial) ÷ t
=  (0 - 7)/3
= -2.33 m/s²
 
        
             
        
        
        
For this question, we use the Coulumb's law to calculate the force on each particles. In this law, force between point charges are said to be proportional to product of each charge and is  indirectly proportional to the distance of both charges. We do as follows:
F= kq(1)q(2)/d^2 
  = (9x10^9).(1.41 x 10^-5 C).(-<span>1.41 x 10^-5 C</span><span>)/.44^2 
</span>  = 4.067 N