How Does Air Resistance Affect Car Velocity?

[Izekid]

The Air Resistance of a car grows proportional to the square of the velocity. On a certain car is the air resistance 0,18kN when the velocity is 54km/h.

So the problem is ..

What is the air resistance when the velocity is 90 km/h?

How high is the velocity when the air resistance is 0,30kN?

I don't understand how to do this please help me...

 

[Astronuc]

The Air Resistance of a car grows proportional to the square of the velocity.

Write an equation which gives the relatioship for Air Resistance and the square of velocity.

Then solve for the constant since one is given a value for air resistance and the corresponding velocity.

 

[quicknote]

I can provide you with a formula that can help you solve these problems. The formula for air resistance is given by F = 0.5 * p * v^2 * A, where F is the air resistance force, p is the air density, v is the velocity, and A is the frontal area of the car.

To solve the first problem, we can plug in the given values of air resistance (0.18 kN) and velocity (54 km/h) into the formula and solve for A. Once we have the value of A, we can use it to find the air resistance at a different velocity (90 km/h) by plugging it into the formula with the new velocity value.

To solve the second problem, we can use the given air resistance value (0.30 kN) and the formula to solve for the velocity. We can rearrange the formula to solve for v, which will give us the velocity at which the air resistance is 0.30 kN.

I hope this helps you understand how to approach and solve these types of problems. It is important to use the correct formula and plug in the given values to find the desired solution. If you need further assistance, please don't hesitate to ask for clarification.