The density would decrease because the mass of an object deals with the amount of atoms in the object and since none of the object was reduced "a" wouldn't be the answer. Depending on the amount and period of time that the heat is applied the liquid could change into a gas so "d" wouldn't be correct. Density is the mass÷ volume, and when you add heat to an object it could take up different amounts of space because of its particles gaining energy and spreading apart. So the density would decrease because of the volume increasing. So I believe that "c" is the answer.
        
             
        
        
        
Then every line segment has one and only one mid-point.
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Answer:
Explanation:
Given
Weight of person  
 
At highest point Magnitude of the normal force  
 
net force at highest point 
 
 
where  centripetal force
 centripetal force
 
 
 Normal Force
 Normal Force
 
 
 
 
Negative sign shows force is in upward direction
At bottom point centripetal force is towards the bottom
 
 
 
 
