Question

Chapter 15 Pressure on a Dam Due 4 of 16 ( As the reservoir behind a dam is filled with water pressure that the water exerts on the dam increases Eventually, the force on the dam becomes substantial, and it could cause the dam to collapse. There are two significant issues to be considered: First, the base of the dam should be able to withstand the pressure Agh, where ? is the density of the water behind the Consider a horizontal layer of the dam wall of thickness dx located a distance z above the reservoir floor What is the magnitude dF of the force on this layer that results from adding the water to the reservoir? Express your answer in terms of z, dar, the magnitude of the acceleration due to gravity g, and any quentities from the problem introduction. 1. 18 dam, h is its depth, and g is the magnitude of the View Available Hint(s) acceleration due to gravity. This means that the material of which the dam is made needs to be strong enough so that it doesn't crack (compressive strength) The second issue has to do with the strength of the foundation of the dam. The water pressure exerts a dFa 4. Pr dlockwise torque on the dam, shown in (Figure 1). The foundation of the dam should be strong enough so that the dam does not topple. The material has to be strong enough that the dam does not snap (shear strength) 5. Pr 6. P To study this phenomenon, consider the simple model of a dam depicted in (Figure 1). A reservoir of water Part B 7. A (density p) behind the dam is filled to a height h The force of the added water produces a torque on the dam In a simple model, if the torque due to the water were enough to cause the dam to break free from its foundation, the dam would pivot about its base (point P). What is the magnitude r of the torque about the point P Assume that the width of the dam (the dimension 8. Re Figure 1 of 1 due to the water in the reservoir? Express your answer in terms of quantities given in the problem introduction and the magnitude of the acceleration due to gravity g View Available Hint(s) Submit 14. P

Answer 1

A The dam pressure, P is, PO The fora louph due to wsalen in tha vesenvoir, d F e, fora po dutes torque on the dam s, 9ngratirg on both sides 02