A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m3 of water and the surface area of the bottom of the container is 5.00 m2. The height of the lower part of the container is 2.50 m and the neck contains a column of water 8.50 m high. The total volume of the column of water in the neck is 0.200 m3. What is the magnitude of the force exerted by the water on the bottom of the container?
Question
A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m3 of water and the surface area of the bottom of the container is 5.00 m2. The height of the lower part of the container is 2.50 m and the neck contains a column of water 8.50 m high. The total volume of the column of water in the neck is 0.200 m3. What is the magnitude of the force exerted by the water on the bottom of the container?
Solution
To solve this problem, we need to find the pressure at the bottom of the container and then use that to find the force.
Step 1: Find the pressure at the bottom of the container.
The pressure at the bottom of the container is due to the weight of the water above it. The pressure due to a column of fluid is given by P = ρgh, where ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column.
The total height of the water column is the height of the water in the lower part of the container plus the height of the water in the neck, which is 2.50 m + 8.50 m = 11.0 m.
The density of water is approximately 1000 kg/m^3 and g is approximately 9.81 m/s^2.
So, the pressure at the bottom of the container is P = (1000 kg/m^3)(9.81 m/s^2)(11.0 m) = 107910 Pa.
Step 2: Find the force exerted by the water on the bottom of the container.
The force exerted by a fluid on a surface is given by F = PA, where P is the pressure and A is the area of the surface.
The area of the bottom of the container is given as 5.00 m^2.
So, the force exerted by the water on the bottom of the container is F = (107910 Pa)(5.00 m^2) = 539550 N.
Therefore, the magnitude of the force exerted by the water on the bottom of the container is 539550 N.
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