A horizontal aquifer is overlain by 73.5 ft of water-saturated clay with a porosity of 0.4. The solid density of the clay particles is 165 lb/ft3. The specific weight of water is 62.4 lb/ft3. Calculate the total stress acting on the top of the aquifer.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

that the claims meet official rules.

don't misinterpret the claims

the components of a vector are the parts of the vectors that are to each other.

b perpendicular

3. dark matter

empty space could also be a simple vacuum