The normal reaction force exerted by the plane on the block is [tex]mgcos\theta[/tex]
For a block of mass M on an inclined plane, the normal reaction acting on the plane is always equal to the weight of that object
The formula for calculating the weight of the object is expressed according to the formula:
W = mg
m is the mass of the object
g is the acceleration due to gravity
Since the body is inclined at an angle theta, the weight will be resolved along the horizontal to have [tex]W = mgcos\theta[/tex]
Since the normal reaction force is equal to the weight, hence [tex]W=R=mgcos\theta[/tex]
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