Answer:
Total pressure= 120945[Pa]
Force exerted = 29026800 [N] or 29.02*10^6 [N]
Explanation:
We know that the total pressure is the result of the sum of the atmospheric pressure plus the manometric pressure. The equation is:
In this problem we know the atmospheric pressure 101.325x10^3 [Pa], therefore we need to find the manometric pressure.
The manometric pressure in the bottom of the swimming pool depends only on the water column of water generated (depth of the swimming pool)
where:
density = density of the water 1000 [kg/m^3]
g= gravity [m/s^2]
h= column of water (meters)
replacing the values:
![Pman= 1000 *9.81* 2 = 19620 [Pa]\\\\](https://tex.z-dn.net/?f=Pman%3D%201000%20%2A9.81%2A%202%20%3D%2019620%20%5BPa%5D%5C%5C%5C%5C)
The total pressure will be:
![Ptotal= 101325+19620 = 120945 [Pa]\\\\](https://tex.z-dn.net/?f=Ptotal%3D%20101325%2B19620%20%3D%20120945%20%5BPa%5D%5C%5C%5C%5C)
The force exerte on the bottom is defined by the following expression:
Answer:
Different surfaces have different impact force during collision which depends on the time it takes the person to come to rest after collision.
Explanation:
Given;
speed on concrete = 12 m/s (27 mi/h)
speed on soil = 15 m/s (34 mi/h)
speed on water = 34 m/s (76 mi/h)
The impact force on this person during collision is rate of change of momentum;
During collision, the force exerted on this person depends on how long the collision lasts; that is, how long it takes for this person to come to rest after collision with each of the surfaces.
The longer the time of collision, the smaller the force exerted by each.
It takes shorter time for the person to come to rest on concrete surface than on soil surface, also it takes shorter time for the person to come to rest on soil surface than on water surface.
As a result of the reason above, the force exerted on the person during collision by the concrete surface is greater than that of soil surface which is greater than that of water surface.
Time = (distance covered) / (speed)
Time = (224 mi) / (56 mi/hr)
<em>Time = 4 hours</em>
