Question

5. A dam is used to hold back a river. The dam has a height H = 12 m and a width W Assume the density of water at 4°C. = 10 m. (a) Determine the net force on the dam. (b) Why does the thickness of the dam increase with depth?

Answer 1

1. 
   τημάυρη, Vay sa 5. Pensity of water at 4c, S = 1000kg/m3 ngth Consider a small strip of dam, dy' at a depth 'h from surface of ہیر Pressure on that strip, P= heg Small force on that strip, dF = P x Aread - Ihry=H (H = congrat = px way dhtdy=ol dF = hgg way dy=-dh F = 8 megustath) - - Igw ſhe F- sgu # 10-9RYD12? na face, F= 70560 N) 2 2
   
   6 Pressure is mereasing with Increasing depth , P = hgg so in order to hold large pressure thickness has to be increase