Question

The figure below shows the cross section of a road cut into the side of a mountain. The solid line AA' represents a weak bedding plane along which sliding is possible. Block Bdirectly above the high way is separated from uphill rock by a large crack (called a  joint), so that only friction between the block and the bedding plane prevents sliding. The mass of the block is 1.90 ? 10⁷ kg, the dip angle ? of the bedding plane is 29

Answer 1

the force needed is F = u mg cos(theta) = 0.67x1.9x10^7 x 9.8 cos(29)
= 1.09 x10^7 N (nearly)