Answer a would be correct since velocity is a vector and has a magnitude and a direction. In this case v₁ = - v₂.
        
                    
             
        
        
        
Answer: n=4
Explanation:
We have the following expression for the volume flow rate  of a hypodermic needle:
 of a hypodermic needle:
  (1)
  (1)
Where the dimensions of each one is:
Volume flow rate 
Radius of the needle 
Length of the needle 
Pressures at opposite ends of the needle  and
 and 
Viscosity of the liquid 
We need to find the value of  whicha has no dimensions, and in order to do this, we have to rewritte (1) with its dimensions:
 whicha has no dimensions, and in order to do this, we have to rewritte (1) with its dimensions:
 (2)
  (2)
We need the right side of the equation to be equal to the left side of the equation (in dimensions):
 (3)
  (3)
 (4)
  (4)
As we can see  must be 4 if we want the exponent to be 3:
 must be 4 if we want the exponent to be 3:
 (5)
  (5)
Finally:
 (6)
  (6)
 
        
             
        
        
        
Answer:
Physical activity or exercise can improve your health and reduce the risk of developing several diseases like type 2 diabetes, cancer and cardiovascular disease. Physical activity and exercise can have immediate and long-term health benefits. Most importantly, regular activity can improve your quality of life.
Explanation:
<h2><em>hope</em><em> </em><em>it</em><em> </em><em>is</em><em> </em><em>helpful</em><em> </em><em>for</em><em> </em><em>you</em><em> </em></h2><h2><em>keep</em><em> </em><em>smiling</em><em> </em></h2>
 
        
             
        
        
        
<span><u><em>This begins with the sun’s radiation,
which is absorbed differently on the earth’s surface. The earth's
surface is heated differently because of scenarios like cloud cover,
mountains, valleys, water bodies, vegetation and desert lands.</em></u>
<u><em></em></u>
<u><em>Good luck! </em></u></span><u><em></em></u>
        
                    
             
        
        
        
Answer:
The velocity is  
 
Explanation:
From the question we are told that 
    The mass of the ball is  
    The radius is  
    The force is  
    The speed of the ball is  
Generally the kinetic energy at the top of the circle is mathematically represented as 
     
=>  
   
=>  
  
Generally the work done by the force applied on the ball from the top to the bottom  is mathematically represented as 
        
Here  d is the length of  a semi - circular arc which is mathematically represented as 
        
So 
       
       
Generally the kinetic energy at the bottom is mathematically represented as 
       
=>    
=>   
From the law of energy conservation 
      
=>    
=>    