D, I believe is the correct answer. Hope I answered your question, have a good day.<span />
        
             
        
        
        
3 Newtons toward the right because Newton’s second law:
F = ma
15N - 12N = ma
3N = ma
(With the right being the positive direction and the left the negative direction)
        
             
        
        
        
Answer:


Explanation:
<u><em>Finding the net force:</em></u>
<u><em>Firstly , we'll find force of Friction:</em></u>

Where  is the coefficient of friction and m = 13.6 kg
 is the coefficient of friction and m = 13.6 kg


<u><em>Now, Finding the net force:</em></u>


<u><em>Finding Acceleration:</em></u>



 
        
             
        
        
        
Answer:
Explanation:
ASSUMING the 52° is the angle of incidence measured from the perpendicular to the surface
           n₁sinθ₁ = n₂sinθ₂
           1 sin52 = 1.33sinθ₂
                   θ₂ = arcsin(sin52 / 1.33)
                   θ₂ = 36°
as measured from the perpendicular to the surface
 
        
             
        
        
        
To solve this problem it is necessary to apply the concepts related to gravity as an expression of a celestial body, as well as the use of concepts such as centripetal acceleration, angular velocity and period.
PART A) The expression to find the acceleration of the earth due to the gravity of another celestial body as the Moon is given by the equation

Where,
G = Gravitational Universal Constant
d = Distance 
M = Mass
 Radius earth center of mass
 Radius earth center of mass 
PART B) Using the same expression previously defined we can find the acceleration of the moon on the earth like this,



PART C) Centripetal acceleration can be found throughout the period and angular velocity, that is

At the same time we have that centripetal acceleration is given as

Replacing


