Physics Problem with Lifting Force and Drag Coefficient

In summary, the conversation is about calculating the lifting force and drag coefficient for a flying aircraft X, which was designed in 2014 and has a top speed of 812 m/s, a mass of 72,000 kg, and a maximum thrust to weight ratio of 0.44. The equations used are the drag coefficient formula and the lifting force formula, which are both dependent on variables such as air density, velocity, and surface area. The student is unsure about how lifting force works and requests a free body diagram and clarification on whether lifting force is equal to weight.
  • #1
Q7heng
10
0

Homework Statement


Flying aircraft X is designed in 2014. The current model has a top speed of 812 m/s, a mass of 72,000 kg when fully loaded, and a maximum thrust to weight ratio of 0.44. Calculate the lifting force and the drag coefficient for the Quinjet when it is flying level at top speed. Assume turbulent flow.

Homework Equations


Drag Coefficient: Fd = cd 1/2 ρ v2 A

The Attempt at a Solution


I do not understand how lifting force work(teacher didn't bother to teach us before assigning the homework) and can only calculate drag coefficient given the surface area.
 
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  • #2
Can you draw a free body diagram of an aircraft in level flight at constant velocity? What is the lifting force equal to?
 
  • #3
billy_joule said:
Can you draw a free body diagram of an aircraft in level flight at constant velocity? What is the lifting force equal to?
Is the lifting force just equal to the weight?
 

Related to Physics Problem with Lifting Force and Drag Coefficient

1. What is the lifting force in physics?

The lifting force in physics is the force that acts in the opposite direction of gravity, allowing an object to rise or stay airborne. In other words, it is the force that counteracts the weight of an object and keeps it from falling.

2. How is the lifting force calculated?

The lifting force can be calculated using the equation F = ρAv²CL, where ρ is the density of the fluid, A is the object's cross-sectional area, v is the velocity of the fluid, and CL is the coefficient of lift. This equation is known as the lift equation.

3. What is the drag coefficient in physics?

The drag coefficient in physics is a dimensionless quantity that represents the resistance an object experiences as it moves through a fluid. It takes into account factors such as the object's shape, size, and speed, and is used to calculate the amount of drag force acting on the object.

4. How is the drag coefficient determined?

The drag coefficient can be determined experimentally by measuring the drag force on an object at different velocities and angles and then calculating the ratio of the drag force to the dynamic pressure of the fluid. It can also be calculated using mathematical models and simulations.

5. How do the lifting force and drag coefficient affect flight?

The lifting force and drag coefficient play crucial roles in flight. The lifting force allows an object (such as an airplane) to stay airborne, while the drag coefficient determines the amount of resistance the object experiences as it moves through the air. By adjusting these factors, engineers can optimize flight and improve the efficiency of aircraft.

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