Problem 1. A dam 4m on top, 18m at the bottom and 25 m high has water 20 m deep acting on its vertical sides
a) Compute the vertical resultant force.
b) Compute the factor of safety against overturning
c) What is the stress at the heel. Wt of concrete \( =2200 \mathrm{~kg} / \mathrm{m}^{3} \)