Answer:
Explanation:
There will not be any internal reflection . it will be only refraction 
critical angle = θ
Sinθ = 1 / μg
μg = 1.43 / 1.33 = 
Sinθ = 1.33 / 1.43
= .93
θ = 68.44 
angle of incidence i = 68.44 / 2
= 34.22
Sin i / Sin r = μw = 1.33 / 1.43  
= .93
sin 34.22  / sinθ₁ = .93 , θ₁ is angle of refraction. 
 sinθ₁ = sin 34.22 / .93
= .5623 / .93
= .6047
θ₁ = 37 degree Ans 
 
        
             
        
        
        
Lol i think someone would be fired from their job if they threw food
        
             
        
        
        
Answer:
F= 25/2 = 12.5N
Explanation:
When you use a compound pulley the force required depends on the mechanical advantage of the compound pulley. This is known as rate of loss of distance or the ratio of the force to the load.
M.A = Effort distance /Load distance. OR M.A = Load/Effort
 
        
             
        
        
        
Answer:
When there is wind it takes longer
Explanation:
With no wind, the round trip time is

When we have a constant wind speed w

comparing the reciprocal times;

This means that t1 is smaller than t2, ergo, it takes longer with wind