Explanation:
The new volume of water = 25 ml
The old volume of water = 15 ml
The difference = 25 - 15 but what are the units?
Since the question asks for force, the units must start out as 10 mL 
In water 1 mL has a mass of 1 gram, so the answer is 10 grams. 
Grams are units of mass, not weight. You should convert this into newtons. 
10 grams = 1/1000 = 0.01 kg
1 kg has a weight of 9.81 Newtons
0.01 kg has a weight 0.081 Newtons
If you have never seen a Newton before, then the answer is 10 grams
 
        
             
        
        
        
It is possible, but very slim. The fish will move before the spear goes through its body because the fish will sense danger and feel it hit the water and automatically move
        
             
        
        
        
The required value of the index of refraction of glass is 1.5.
Given data:
The speed of light in a vacuum is,  .
.
The speed of light in a glass is,  .
.
Light has the tendency to travel from one medium to another, then the difference between the speeds of light in various mediums is determined by a term, known as the index of refraction. The mathematical expression for the index of refraction of glass is,
n = c / v
Solving as

Thus, we can conclude that the required value of the index of refraction of glass is 1.5.
Learn more about the index of refraction here:
brainly.com/question/17156275
 
        
             
        
        
        
The answer is D, Carbon and hydrogen