Trouble with a basic fluid force problem

In summary, there was a discussion about the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater. The formula used was Force= (Density of water)(Area)(Depth)(gravity), and after plugging in the values, the result was 78400 N. However, the correct answer should be 39,200 N/m^2. It was then realized that the calculation was for force instead of pressure, and the correct formula is P=F/A. This explains why the answer needed to be divided by 2 and also changes the units.
  • #1
Wyoming Physics
10
0
What is the pressure on a horizontal surface with an area of 2m^2 that is 4m underwater?

I tried to just use the formula: Force= (Density of water)(Area)(Depth)(gravity), plugging in the values Force=(1000kg/m^3)(2m^2)(4m)(9.8m/sec^2) and get 78400 N, when in reality the real answer is supposed to equal 39,200 N/m^2.
 
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  • #2
I can confirm your answer. Maybe someone forgot a factor of 2?
 
  • #3
Ahhh nevermind, I have been calculating the FORCE on the plate and not the PRESSURE on the plate which is P=F/A which would explain they I have to divide the force by 2.
 
  • #4
Oh, good point. It also changes the units.
 

FAQ: Trouble with a basic fluid force problem

1. What is a basic fluid force problem?

A basic fluid force problem is a type of physics problem that involves the calculation of forces exerted by a fluid on an object, or the forces experienced by a fluid as it moves through an object or system.

2. What are some common examples of basic fluid force problems?

Examples of basic fluid force problems include calculating the force exerted by water on a dam, determining the lift force on an airplane wing, or finding the pressure on the bottom of a swimming pool.

3. What are the main principles involved in solving a basic fluid force problem?

The main principles involved in solving a basic fluid force problem include the laws of motion, the equation of continuity, and the Bernoulli's principle. It also requires an understanding of fluid properties such as density, viscosity, and pressure.

4. How do you approach solving a basic fluid force problem?

The first step in solving a basic fluid force problem is to clearly define the problem and identify the known and unknown variables. Then, use the relevant principles and equations to set up and solve the problem, making sure to use the correct units and apply any necessary assumptions or approximations.

5. What are some common challenges in solving a basic fluid force problem?

Some common challenges in solving a basic fluid force problem include dealing with non-ideal conditions, such as turbulent flow, and accounting for all relevant forces and variables. It can also be difficult to visualize and conceptualize the problem, so it is important to use diagrams and diagrams to aid in understanding.

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