The plaque has mass of the 4kg and it is repose static Find

The plaque has mass of the 4kg and it is

repose (static). Find the R

Solution

R will be such that vertical equilibrium of plaque is maintained

total vertically downward force acting on plaque = (4+8+3)*10=150 N

For vertical equilibrium,vertically upward force = vertically downward load

Therefore, R= 150 N