The answer is letter C.
Because we classify something as a star when it is: a large ball of gas that undergoes nuclear fusion. Given this definition, a comet is not a star. A comet is a ball of ice and dirt hurtling through space, it shines only because it reflects ligh
        
             
        
        
        
Answer: 30 m/s
Explanation:
Use the first kinematic equation for linear motion

 
        
             
        
        
        
Based on the liquids viscosity (which is a measure of how quickly/slowly a fluid can flow).
Higher viscosity represents a "thicker" liquid & slower flow (honey)
Lower viscosity represents a "thinner" liquid & quicker flow (vinegar)
        
                    
             
        
        
        
The Kj of heat that  are needed to completely vaporize 1.30  moles of H2O  if  the heat of vaporization  for water is 40.6 Kj/mole  is calculated as  below
Q(heat) = moles x heat  of vaporization)
=1.30 mol  x40.6 kj/mol= 52.78 Kj  is needed