Answer:
The distance between the 2 points is 4.6558 meters.
Explanation:
The distance between 2 points  is given by
 is given by

In our case the given 2 points are  hence the distance is
 hence the distance is 

 
        
             
        
        
        
Answer:
It is True
Explanation:. 
A  commander assigns a zone reconnaissance mission when he seeks additional information on a zone before committing other forces in the zone. It is appropriate when the enemy situation is vague,  existing knowledge of the terrain is limited, or combat operations have altered the terrain. A zone  reconnaissance could include several route or area reconnaissance missions assigned to subordinate units.
 
        
             
        
        
        
Answer:
83.6°
Explanation:
For the ray to be totally internally reflected, at the boundary, the angle of refraction is 90. Using the law of refraction where 
n₁sinθ₁ = n₂sinθ₂ where n₁ = refractive index of prism = 1.5, θ₁ = critical angle in prism, n₂ = refractive index of air = 1 and θ₂ = refractive angle = 90°.
So, substituting these values into the equation,
n₁sinθ₁ = n₂sinθ₂
1.5 × sinθ₁ = 1 × sin90
1.5 × sinθ₁  = 1
sinθ₁ = 1/1.5
sinθ₁ = 0.6667
θ₁  = sin*(0.6667)
θ₁  = 41.8°
So, for total internal reflection, an incidence angle of 41.8° is required. So, a full convergence angle of 2 × 41.8° = 83.6° is required for the whole bundle of rays.
 
        
             
        
        
        
Motion of things cause the energy such as the nuclear and the chemicals around temperature traveles