Density, force and velocity

In summary, the formula for calculating density is D = m/v, where D represents density, m represents mass, and v represents volume. Density affects force by determining the weight of an object and the relationship between force and velocity is direct. Force can be calculated using Newton's second law, F = ma, where F represents force, m represents mass, and a represents acceleration. The density of an object does not directly affect the speed of an object, but can impact the amount of force needed to accelerate it to a certain speed.
  • #1
Shizzukani
1
0
1. A strong wind of speed 33 m s^–1 blows against a wall. The density of the air is 1.2 kg m^–3. The wall has an area of 12 m^2 at right angles to the wind velocity. The air has its speed reduced to zero when it hits the wall.
What is the approximate force exerted by the air on the wall?



2. ρ= m/v. F= m/a



3. I have no idea how I would do this.
 
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  • #2
Welcome to Physics Forums. This is a rate-of-change-of-momentum problem. Do you know how to calculate the rate at which mass strikes the wall (kg/sec)?
 

1. What is the formula for calculating density?

The formula for density is mass divided by volume. This can be written as D = m/v, where D represents density, m represents mass, and v represents volume.

2. How does density affect force?

Density affects force by determining the weight of an object. An object with a higher density will weigh more and therefore have a greater force due to gravity acting on it.

3. What is the relationship between force and velocity?

Force and velocity have a direct relationship. This means that as force increases, velocity also increases. Similarly, when force decreases, velocity decreases as well.

4. How is force calculated using Newton's second law?

Newton's second law states that force equals mass times acceleration. This can be written as F = ma, where F represents force, m represents mass, and a represents acceleration.

5. How does density affect the speed of an object?

The density of an object does not directly affect the speed of an object. However, an object with a higher density will have a greater mass, which in turn requires more force to accelerate to a certain speed.

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