Answer:
The force is  
Explanation:
The diagram for this question is shown on the first uploaded image 
    From the question we are told that 
           The weight of the gate is 
   
The vertical component of F is  
    From the diagram , taking moment about the pivot we have  
                 
Where  is the weight of the gate evaluated as
  is the weight of the gate evaluated as 
              
=>        
=>         
=>      
 
        
             
        
        
        
Answer:
B) Water is a solvent
Explanation:
Among many other chemicals, water can dissolve a variety of substances. The solvent properties of chemicals are far beyond it. That property makes water a universal solvent.
Water has one atom of oxygen and two atoms of hydrogen.
One side of the water molecule is positively charged and the other side is negatively charged. This property attracts other substances like salt and disintegrates into positive and negatively charged ions. This property is due to its physical and chemical nature.
 
        
             
        
        
        
7.17m/s glad I could help