Lift Definition and 593 Threads

The figure shows a bicycle wheel resting against a small step whose height is h = 0.110 m. The weight and radius of the wheel are W = 29.0 N and r = 0.350 m. A horizontal force F is applied to the axle of the wheel. As the magnitude of F increases, there comes a time when the wheel just begins...

OK, so the coefficient of lift for a wing is CL. For an airfoil, it is cl. How do I go from Lift for an airfoil to Lift for the whole wing? Is it just multiplying by the wingspan? Thanks!

I have a 300 kg piano being lifted at a steady speed from the ground to a hieght of 10 meters and the crane that is doing the lifting is providing 400 watts of power. How much time does it take to get the piano to the top. So far I have Power = work/Time so time is Work/ power , so, work is...

I have a 300 kg piano being lifted at a steady speed from the ground to a hieght of 10 meters and the crane that is doing the lifting is providing 400 watts of power. How much time does it take to get the piano to the top. So far I have Power = work/Time so time is Work/ power , so, work is...

does it make since if it takes 675 food Calories to lift me up 17 ft look below *IGNORING HORIZONTAL DISTANCE* i got to figure out how much work is done to get myself up from my class to the cafeteria which is 17 ft in vertical hieght PE=mgh my weight is 120 lbs i converted to mass...

A 4510 kg helicopter accelerates upward at 2.1 m/s^2. What lift force is exerted by the air on the propellers? The answer is in Newtons. If you can give me an equation, that would be great. Thanks

A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 630 cm2. It is filled with oil of density 690 kg/m3. I've found that approx. 63.5 kg of mass must be placed on the small piston to support a car of mass 1600 kg at equal fluid levels. but then it asks...

A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 630 cm2. It is filled with oil of density 690 kg/m3. I found that about 63.5 kg of mass must be placed on the small piston to support a car of mass 1600 kg at equal fluid levels. But then it asks... With...

Is there any formula to find the lift genetated by a helicopter propeller?

I recently read an article where the author stated that the momentum transferred to the air by a passing wing will eventually strike the earth, even from a high cruise altitude (in other words, out of ground effect) I have a problem with this for the following reasons, feedback would be...

I have read a number of the forums on lift generation, and I would like to add some comments for feedback. I read the forum describing lift as the centripetal force required to curve the airflow (streamlines), and I must say this makes absolute sense, I myself have always believed that...

If the propeller is placed in front of wings and since the job of the propeller is to accelerate the airflow, wouldn't it result in faster airflow around the wing resulting in increased lift?

Puzzle: A man leaves for his office and takes the lift from the 60th floor to the ground floor. When he returns back he takes the same lift to the 45th floor and then walks up to the 60th floor. Why? Points to remember: 1. He is not a health freak 2. He does not have any relatives or...

I came across this question while looking around the forums at physlink.com: There are birds of mass 20 tonnes in a van of mass 10 tonnes. The back of the van is closed(no air can go in or come out). If now the birds start flying, will the weight of the van decrease? I ask this question...

As you may have noticed I've got a bit of a rollercoaster theme going. My problem now is i have an 800 kg cart and I need to calculate the work done by bringing it to the top of the rollercoaster. The slope of the lift is 20 degrees and the maximum height is 30 m. From this i calculated the...

When firing my pulse jet I tried various approaches at increasing its' performance without significantly increasing its' weight. When (while holding a piece of larger diameter pipe with channel locks) introducing a larger diameter than the jet diameter pipe into and partially allowing the...

http://img258.echo.cx/img258/4409/lift3ad.png A painter in a crate hangs alongside a building. When the painter, who weighs 1000 N, pulls on the rope, the force he exerts on the floor of the crate is 450 N. If the crate weighs 250 N, find the acceleration. (ans=1.96 m/s²) Lift...

Hey, I'm trying to measure the lift/drag of a wing in a low-speed wind tunnel, the only ways i might know are using a load cell or force probs, but have no idea about how to set it all up and my school doesn't have the material. So please, can u give me any way using simple things to measure...

I need an equation to solve for the distance traveled of a projectile. The variables that I have are lift coefficient, drag coeficient, launch angle and initial velocity. Could someone please help me find the formula I need. Thank you.

What are the equations used to determine the streamflow and lift for Micro Aerial Vehicles? What are the problems with MAVs?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the box...

Hello All... I am just wondering about something. The lift equation is, L= \frac {C_L \rho A V^2} 2 where C_L= coeficient of lift \rho= air density A= area of wingspan V= velocity of the aircraft Does anyone have idea on what the...

Does anyone have a diagram and/or explination of Bernouilli's principal of lift?

A recently closed thread dealt with the generation of aerodynamic lift, in particular tied to a severe and justified criticism of the "equal transit time"-principle, which often is also called the "Bernoulli effect". However, from what I read, no one showed how streamline arguments can...

A tennis ball may leave the racket of a top player on the serve with a speed of 62.0 m/s. If the ball's mass is 0.0600 kg and it is in contact with the racket for 0.0200 s, what is the average force on the ball? Would this force be large enough to lift a 60 kg person? large enough or not...

A school mate of mine was joking when he said you can lift your wind tunnel up if you mount the airfoil to the sides with the high Angle of attack and fast enough airflow. Is this true? If you have say a rectangular glass wind tunnel (fish aquarium shape) and put a large size wing and fast...

A box weighs 2000N and is accelerated uniformly over a horizontal surface at a rate of 8 m/s^2. The opposing force of friction between the box and the surface is 27.4 .. How much force would be required to lift the box upward with an acceleration of 8 m/s^2? I know that the answer is...

Hi - Here's the entire problem to avoid confusion >< "A kite is flying at a height of 500 ft and at a horizontal distance of 100 ft from the stringholder on the ground. The kite string weighs 1/16 oz/ft and is hanging in the shape of the parabola y=(x^2)/20 that joins the stringholder at...

I been having trouble lately with my phyiscs HW probs. Here is only that ti'm confused on: Three wires are connected to form a vertical H. The cross piece, mass 0.050 kg and length 0.10m , can slide up and down the vertical wires without friction. The device is placed in a horizontal field...

Hello, I thought I knew how to solve for this problem but alas I was wrong. I'm hoping someone will be able to point me in the right direction. Here's the problem: A 1.40x10^2 kg piano is being lifted at a steady speed from ground level straight up to an apartment 18.0m above the ground...

Is there any research being done towards the concept of a gravity lift? Is this purely a sci-fi idea or is there merit to it? I haven't the slightest idea how gravity works or what the source of the force is, but I'd like to learn more.

Evryone knows that the work done by a magnetic field is zero. Then how does a permanent magnet lift iron filings.

We all know that the work done by the magetic field is zero. But, how does the magnetic field lift iron objects?

Alright. I submit. I'm lost. I've been working on a plan for a derigible, or airship, and found that I've run into a problem. I've been using the equasion: [(H x W x L) x Pi] / 3 to calculate the capacity of the airbags within the derigible. I don't think this is correct so please help me...

I want to know how to calculate the amount of force req. in the given picture. I want to lift the load 3 meters high. Can anyone help.

Hi I wanted to get clear on this conclusion of lift distribution along the span of a wing. Graphs in texts show that for constant chord wings, Cl distribution along the span is eliptical. Conclusions: 1.Induced incidence is greater towards the tip. 2.Lift force at the root is PI/4...

A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 420 cm2. It is filled with oil of density 730 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1000 kg at equal fluid levels? b) With the lift in balance with equal fluid levels...

can someone give me the formula needed to work this problem? A 4655-kg helicopter accelerated upward at 8 m/s2. What lift force is exerted by the air on the propellers?

hey guys i just found this site and its very helpful. so if u guys can help. it will be greatly appreciated i have this problem to solve but i stuck on solveing for the height of the airplane to find the force. so if anyone can assist me it will be great. thanks Lift on an Airplane. Air...

Let's say that I rig up a truck to a giant helium balloon, but I load up the back of the truck with enough stones so that the truck has reached a state of neutral buoyancy--its just floating in mid-air, not rising not falling, just there. Now let's say I take away a one-pound rock from the...

right from what i understood from the brain teaser question about forces on a wing lift come from the pressure difference between the two sides of the wing (faster air on top, u get the picture). i know there are many explenations for lift, but in this one why is it assumed that the air on top...

What two types of forces contribute to the lift on a wing?

Please click here first for some illustrations (otherwise it might be difficult to get my point across). The aerodynamic lift on the wing of an airplane (airfoil) is generally explained by the argument that the faster speed of the air along the top of the wing leads to reduced air pressure...