Drag Definition and 713 Threads

So if I double the velocity, aerodynamic drag doubles as well?

Information: "In downhill speed skiing a skier is retarded by both the air drag force on the body and the kinetic frictional force on the skis. Suppose the slope angle is θ = 31.5°, the snow is dry snow with a coefficient of kinetic friction μk = 0.0400, the mass of the skier and equipment is m...

Imagine separating a parabola into its different x and y components and linking them by the component of time. Scenario: Given: Gravity No Drag The velocity of the launched object is not sufficient to escape the gravitational pull. Ignoring: The change of gravity as the distance...

Hi, just found these forums, and they look very useful. I'm a second year Aerospace Engineering student, and as part of a project I'm modelling the first stage of a Saturn V rocket. I'm using a linear and non-linear model, and have all the equations sorted out. The only problem is I can't...

1. An F-15 touches down with a velocity of 100m/s. The only decelerating force acting on it is the drag, given by- How far does the aircraft move before it stops?2. D = 1/2 x Cd x ρ x A x v^2 (add in your own values for Cd, ρ, and A) a = (-D/m)3. Since the D depends on the...

In physics class we made a rocket and test fired it. Now we are given the thrust and we found out the max height of the rocket and the time of flight. Max Height = 76m Time of thrust/ upward acceleration = .8s Time of flight with only gravity acting until velocity is 0 . = 4.96s (not...

We did a lab where we dropped three spheres into two different fluids, measured their velocities, and found drag coefficients. We were also asked some theory questions, and these are what I need help with. Spheres: 3.175 mm, 0.05 g Teflon 6.35 mm, 0.375 g, aluminum 12.7 mm, 8.36 g, steel...

Homework Statement The problem reads: "You are stopped at a red light, an identical car to yours pull up alongside. When the light turns green, you and the other car accelerate at a constant rate, but the other car's acceleration is greater. You see another stop light ahead and know you...

Homework Statement A blimp of mass 110 kg is pulled at an angle theta = 52 degrees downwards with respect to the horizontal for D = 7 km on level ground at a constant velocity v = 14 m/s. If the coefficient of drag (K in F = Kv^2) is 0.5 kg/m, how much work is done by the person pulling? As...

Homework Statement This is a real world problem and not a problem in a book, so if you feel I am missing some information just let me know. A ball is flying at 25 m/s The wind is blowing perpendicular to the trajectory at .44704 m/s \rho = \frac{1.17 kg}{{m}^3} Cd = 1/2...

Homework Statement The tanker has a weight 4000 MN and is traveling forward at speed 1m/s in still water when the engines are shut off. If the drag resistance of water is proportional to the speed of tanker at any instant and can be approximated by F=0.65v MN, determine the time needed for the...

I obtained lift and drag forces for an object I was testing in a wind tunnel and I wanted to know if it was possible to do a projectile motion problem with the following variables; I know the initial velocity of the object, V=76m/s, the possible launch angles = 30, 45, or 60 degrees, and...

I'm on a second bachelors -- how much will the first drag me down? I did very badly at my first shot at college. It took me 5 years to barely graduate with an english literature degree. I hated life in college, but I especially hated life after college. In that time I went up to Physics 2...

Homework Statement Missile Calculate the drag force on a missile 48 cm in diameter cruising with a speed of 270 m/s at low altitude, where the density of air is 1.2 kg/m3. Assume C = 0.75. Homework Equations Fd = -1/2p(v^2)CA The Attempt at a Solution...

PLEASE ANSWER BY TONIGHT!: What is an experiment to test drag force...? ...using only a tub about 14inx10inx7in, water, fishing line, a spring scale, fishing weights, and random household objects? we're suppose to design two experiments: one to test the effect of speed on drag force, and one...

Homework Statement A football of mass 0.4 kg travels horizontally above the ground. The ball experiences a drag force of DT = 0.01v2 where v is instantaneous speed. Immediately after the kick the ball has a speed of 15 m/s. How long does it take for the speed to drop to 12 m/s? Homework...

i have just started with physics and i have a project where i have to make a scenario where two cars are drag racing in a quarter mile race and the one with the highest top speed loses. i don't even know where to start.

In my effort of approximating drag constants for bullets, I have come across the McDrag program, by Robert L. McCoy. The disadvantage is that it approximates drag constants based on a few predefined shapes and a drag model (e.g. G1, G7), limiting it to only the simplest of bullets. Fully...

Homework Statement A sky diver of mass 79.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 53.0 m/s. (a) What is the acceleration of the sky diver when her speed is 30.0 m/s? What is the drag force on the diver when her speed is the following? (b) 53.0 m/s (answer in...

Homework Statement A stone with mass m = 1.8 kg is thrown vertically upward into the air with an initial kinetic energy of 310 J. The drag force acting on the stone throughout its flight is constant, independent of the velocity of the stone, and has a magnitude of 2.5 N. (a) What is the...

I know that standard formula is, FD = 1/2 CD *ApV^2 FD = Drag Force. SI: N CD = Drag Coefficient. SI: Dimensionless (Typical Values) A = Coss-sectional Area perpendicular to the flow. SI: m2 r = Density of the medium. SI: kg/m3 v = Velocity of the body relative to the medium. SI: m/s...

Homework Statement I know that standard formula is, FD = 1/2 CD *ApV^2 FD = Drag Force. SI: N CD = Drag Coefficient. SI: Dimensionless (Typical Values) A = Coss-sectional Area perpendicular to the flow. SI: m2 r = Density of the medium. SI: kg/m3 v = Velocity of the body relative...

2 cars drag racing question... Homework Statement The first car has a constant velocity of 40 m/s and moves 10 m before the 2nd car starts moving. The second car speeds up with an acceleration of 3.6 m/s^2. What is the time and the displacesment before the 2 cars actually meet...

Homework Statement A top fuel drag racer with a mass of 500.0 kg completes a quarter-mile (402 m) drag race in a time of 4.3 s starting from rest. The car's final speed is 115 m/s. What is the engine's average power output? Neglect friction and air resistance. Homework Equations P = W/T...

Homework Statement A gun is fired straight up. Assuming that the air drag on the bullet varies quadratically with speed. Show that speed varies with height according to the equations v^2 = Ae^(-2kx) - g/k (upward motion) V^2 = g/k - Be^(2kx) (downward motion) in which A and B are...

Homework Statement Studetns examine the aerodynamics of a model car which has a drag force in air of 10 N at 10 m/s. They wish to estimate what the drag will be for a full scale model, and the energy lost on a given trip. The drag coefficient C remains constant C= 0.6. The cross-sectional...

Homework Statement If there were no air drag, how fast would drops fall from a cloud 1.6 kilometer above the Earth's surface? Homework Equations am i heading in the right direction if not what am i doing wrong? The Attempt at a Solution i tried converting to m first then i...

Homework Statement Consider a particle of mass m whose motion starts from rest in a constant gravitational field. If a resisting force proportion to the square of the velocity (i.e. kmv^2) is encounterd, show that the distance s the particle falls in accelerating from v0 to v1 is given by...

Homework Statement An object with mass 10kg is dropped from a height of 200m. Given that the constant k in the equation is 2.5Nsm^-1 mv'(t) = −mg − kv(t) approximately how many seconds does the object hit the ground? Homework Equations v' + (k/m)v = -g The Attempt at...

Homework Statement A baseball, with mass m = 0.145 kg, is thrown directly upward from z(0) = 0 m, with initial speed v(0) = 45 m/s. The air drag on the ball is given by Cv2, C = 0.0013 Ns2/m2. Set up a diff. eq. for the ball's movement and solve it for both v(t) and z(t). m = 0.145 kg C =...

hi i need to calculate the drag coefficient of a rotor bade(with two blade).infact i need to calculate the torque by drag,then power required for rotate that rotor on a fixed test stand. who knows about what formula or chart, diagrams... thanks in regards sadegh

A reasonably large object moving though air experiences a drag force proportional to the square of its speed. If an object is falling vertically downward at half its terminal speed, how does the drag force acting on it compare to the force of gravity? express your answer as a multiple of Fg

So I was looking at MIT iTunes U physics videos, and the professor talked about regimes I and II in the video about drag forces. I think regime I has to do with the temperature of the medium and regime II has to do with the density. But, I cannot find that information in my 1st semester physics...

Homework Statement hile playing pool on a cruise ship, you accidentally hit the cue ball over the railing and it falls into the ocean below. If the cue ball (a sphere of diameter = 57.15 mm, m = 160 g) reaches a terminal velocity of 1.55 m/s in the water (), what is the drag coefficient of...

Hi, I'm looking for the formula to get the velocity value from a drag value. I found plenty of resources to do it the other way around (velocity to drag) but no luck to get it the way I need it. This website seems to have it but they don't provide the rule and they actually want money to...

Does anyone have a solution (approximate is fine) for the Drag equation? What I mean by this is that I need to be able to get position and velocity as functions of time for a body falling through air from rest. I managed this for a viscous liquid where drag is approximately linearly...

Can anyone help me work out the air resistence on a wire as it moves along its length? I think it would only experience skin friction if it moved like this and the wire was smooth, so does anyone know how to calculate this? I am having difficulty looking it up.

hey all I have a question and I want to quickly get an answer how to calculate projectile motion with drag a formula even if it is hard would be good mvh. patrick sorry my spelling I'm from abroad

I am interested in calculating the drag force acting on simple objects (cube and sphere) as they passes from a liquid (water) into a gas (air). I can calculate the drag force as the objects travel through a uniform medium, but I am wondering how the drag force on an object changes as it passes...

hi, I am currently building a drag racing game and I am wanting it to be as physically accurate as possible. my question is, when a driver drops the clutch in a vehicle what needs to be taken into account to calculate the force acting on the vehicle while the wheels are spinning? is it possible...

Homework Statement I need to find an expression for the minimum drag coefficient, C_D, of an aircraft during straight and level flight. Homework Equations C_D=C_{D_0}+kC_L^2 Where: C_{D_0} is the profile drag coefficent C_L is the lift coefficient k is just a constant The Attempt at a...

hi small question in the drag coefficient formula for boats and ships, is the reference area, the surface area of the submerged part of the ship/boat? demson

Homework Statement whats the energy required to drag a block a distance L Homework Equations coefficiant of friction between block and floor = \mu density of block = p force*distance = change in kinetic energy The Attempt at a Solution friction acting against movement Fr = \mumg m...

Homework Statement I made a wind tunnel for a science project and i am trying to determine its windspeed. I decided to suspend a pingpong ball on a string in the wind tunnel and measure the angle change. But to do this i need to calculate the drag force and i cannot do this without knowing the...

Hi In a Drag problem, I'm trying to calculate the drag force but I don't know the drag coefficient? Is there any way to calculate it? Thanks

Homework Statement I need something like the equations of motion, but accounting for drag as given by the http://en.wikipedia.org/wiki/Drag_equation" . Particularly for: Homework Equations & v && = v_0+at \qquad & s && = s_0 + v_0t + \tfrac12 at^2 \qquad The...

Homework Statement I'm writing a lab report on drag on a non-rotating cylinder. The drag coefficient is calculated using the Pressure co-efficient. The problem I'm facing is that my lab states that the pressure on the cylinder can be predicted by \left(p-p_{0}\right)_{max} \times cos(\theta)...

I've been told I can derive the drag equation from momentum and force. I have also found a site that has a similar question but no solution. http://www.physics.umd.edu/perg/abp/TPProbs/Problems/D/D30.htm I have an idea of how to get a solution but get stuck.

hey,everyone,could you please explain to me the terms Terminal Velocity and Drag in detail,as my exams are coming up.

Hello, First time post long time lurker! I've got an interesting project I am working on which involves a few MechE subjects. The overall goal (for now) is to determine the drag force of a cylindrical cone headed object in sand under various pressures. The movement of the cylinder is the tricky...