The continent located 40n and 100w is North America
        
                    
             
        
        
        
Answer: This is called the Doppler effect, where waves shift frequency and wavelength as the source travels towards you (higher frequency, shorter wavelength) or away from you (lower frequency, longer wavelength)
Explanation:
hoped this helped have a good day :)
 
        
             
        
        
        
Answer:
Coefficient of static friction will be equal to 0.642   
Explanation:
We have given acceleration 
Acceleration due to gravity 
We have to find the coefficient of static friction between truck and a cabinet will 
We know that acceleration is equal to  , here
, here  is coefficient of static friction and g is acceleration due to gravity
 is coefficient of static friction and g is acceleration due to gravity 
So 
So coefficient of static friction will be equal to 0.642
 
        
             
        
        
        
In a real system of levers, wheels, or pulleys, the AMA is less than the IMA because of friction. 
AMA (Actual mechanical advantage) is found by dividing output force by effort force. The actual mechanical advantage will always be less than the ideal mechanical advantage. The ideal mechanical advantage assumes perfect efficiency which doesn't account for friction, while actual mechanical advantage does. Therefore; the IMA is always greater than the actual mechanical advantage because all machines must overcome friction.