12. A labourer lihis a stack of several identical bricks each of amos 1 kg by pressing hard with us hands,The corfficient of state friction for all surfaces is X= 0,5. The minimum normal force applives byeach hand to just hold the bricks, bold the bricks is 50 N,Which of the following statement is correct?arichea) The number of bricks hold by labourer is 5, if normal force by hand is 50Nb) The number of bricks, hold by labourer is 10, if normal contact force by hand is 50 Nc) If normal contact force applied by labourer is slightly less than 50 N number of bricks hold bylabourer is 10.d) If labourer just hold the stack, the contact force applied by each hand on the brick is 559 N
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- Explanation:
F=mg
f=mg*n
u2N=mg*n
n=u2N/mg
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