Lift Definition and 593 Threads

Hello everyone, Ok I thought I knew gravity and just realized I absolutely have a very poor understanding about it. Ok let's say a person was moving in a lift 1. The blood would pool around the legs because of gravity, but my question is aren't we overcoming the gravity force to go up...

I have been trying to find lift and drag coefficients in terms of pressure. So far I have found multiple equations. Below is what I have found after multiple research on the web. I am using these equations in LabVIEW. My input is going to be upper and lower surface pressure and I have to find cl...

Just munching away on my choclate and notice it has energy 1000kj on the packet. To stop me getting fat, how many times would i have to lift 100kg. Bench pressing it. Probably a few more variables needed i guess. Or is there a formula you can start me off with? ta

Like what's the equation?

I'm having trouble selecting a suitable motor to lift a single leaf 1000kg door. To cut down on power costs i plan to use perfectly (or as close as i can get) balanced counterweights. The door is to be lifted 4m vertically using wire rope hung over two sheaves connected to the respective...

My friend came to me today with an interesting problem. He wants to make some sort of magnet that will make the school band's drumline's snare drums, in essence, levitate. This is for a big school event and he wants to do something special this year. Is it possible to make such a magnet? If so...

I made a machine a few years ago, there seems to be something wrong with it. I need the force to push the object to be equal to the weight 1:1. but it seems that it needs more force to move it. You can see the details in the below diagram. I suspect the mistake is in the angel and that the...

well, if we lay power lines along rails and use the magnetic field to lift trains, would it increase the transmission loss?

Homework Statement If the engine thrust is F(T)=130kN and the plane's weight is W=180kN,determine the atmospheric drag F(D) and the wing lift F(L). What is the distance s to the line of action of the drag force? The Attempt at a Solution Well I have trouble with this question...

Homework Statement A hydraulic lift is used to jack a 970-kg car 12 cm off the floor. The diameter of the output piston is 18 cm, and the input force is 250 N. (A) What is the area of the input piston? (B) What is the work done in lifting the car 12 cm? Homework Equations Fo=mg...

Homework Statement A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 250 cm2. It is filled with oil of density 510 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1200 kg at equal fluid levels? I got this answer - 120 kg...

Homework Statement A commercial airliner cruises at a speed of 284 meters per second. Each wing is 28.8 meters long and has an average width of 1.73 meters. The density of air at cruising altitude is 0.47 kilograms per cubic meter. How much lift force is generated by the wings if the air...

Hi all, I have implemented a nonlinear lifting line method to estimate lift/induced drag of a typical wing. This method utilizes 2D lift coefficient data, and uses a numerical technique to solve the nonlinear equations. The program I have written in MATLAB is working, though I would like to...

Homework Statement Determine the force P required to like the 200kg crate. Coeff. Static friciton is 0.3 on ALL contact of surfaces. Neglect Wedge Mass Homework Equations μS x Fn = Fk Summation of forces eqns The Attempt at a Solution im getting more unknowns than equations see attachment.

Hi I have an installation/art project that requires a rig designed to balance a weight of 3200lbs using a weight of 30lbs. I think that means a mechanical advantage of 107 if using pulleys? Both weights would be suspended in the air by the rig so that someone pulling on the small weight would...

I'm not sure how to work this one... The spring on a safety valve can be compressed 15 mm by a load of 700 kg. In it's working position the compression of the spring is 22 mm. The combined mass of the valve, spring and spindle is 17 kg. Valve diameter is 80 mm. Determine boiler pressure...

In raising a 51 kg piano with a pulley system, workers note that for every 2m of rope pulled down, the piano rises only 0.2m . Ideally, how much force is required to lift the piano? I know the answer is 50 N because it's on my review sheet for a test, but I don't know how it was found. Could...

Homework Statement A man of mass 70 kg stands in a lift on a set of weighing scales. The scales are calibrated in Newtons. Assuming that g=10N kg -1 What weight will the scales register when the : a) lift is static b)lift accelerates down at 10 ms-2 c)lift accelerates up at 10 ms-2...

Let's say we have a rectangular surface or something. How about a piece of plywood. If we were to blow air say using a fan at the top of the wood and keep the air "calm" at the bottom, would it create lift? I know it's not practical but in theory should there be a slight lift?

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 am stumped on how to convert my units for the equation for Force of Lift. FL=CLPA\frac{v^{2}}{2} My equation comes out to: FL=(.76764)(.076\frac{lbm}{ft})(\frac{(65.899\frac{ft}{s})^{2}}{2}) Still figuring out this equation hypertext stuff. Please help if you can. I am supposed to...

I am working on my semester project and have come across a hitch. I am trying to find the Lift Force of my wing using the following equation FL=CL P A (v2/2) Where: FL is Lift Force CL is Coefficient of Lift (I think) P is the density of the fluid (Air) A is the Area V is Velocity...

Homework Statement What is the lift (in Newtons) due to Bernoulli's principle on a wing of area...m^2 if the air passes over the top and bottom surfaces at speeds of ...m/sand ...m/s, respectively? I've given the values but I just want to know if I'm doing the problem right conceptually...

1. 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...

Hi, I'm curious about how the wheels on studio stands are retracted: http://www.bhphotovideo.com/images/images345x345/145489.jpg Under this cast iron base are caster wheels which can be raised or lowered to secure the unit or move it around. A simple press on the foot pedal allows this...

1. Homework Statement Suppose a 66-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl. Homework Equations...

Homework Statement An airplane is flying in a horizontal circle at a speed of 460 km/h (Fig. 6-42). If its wings are tilted at angle θ = 37° to the horizontal, what is the radius of the circle in which the plane is flying? Assume that the required force is provided entirely by an...

Homework Statement Why does the lift curve, Coefficient of lift plotted against angle of attack, go through the origin of the graph for some airfoils but not for other airfoils Homework Equations The Attempt at a Solution

hi, I am required to search the internet to find out what the theoretical value of the lift slope (dcl/dalpha) is for thin airfoils. Cl is the lift coefficient and alpha is the angle of attack of the airfoil. Does anyone have any ideas? Thanks for your time.

Helicopter lift... can i know the helicopter lift equation, torque produced in the main rotor,rpm variation with the tail and main rotor?

Homework Statement Lifts usually have signs indicating their maximum capacity. Consider a sign in a lift that reads “maximum capacity 1120kg or 16 persons”. Suppose that the weights of lift-users are normally distributed with a mean of 68kg and a standard deviation of 8kg. (a) What is the...

Hello, I believe we have seen that when a car is traveling in high speed and wants to make a sharp turn, the outer wheels actually sort of like lift of the ground right? What is the cause of this? I was thinking that it might have something to do with moments about the inner wheels? Its has...

Homework Statement A 13,000-kg helicopter accelerates upward at 0.37 m/s^2 while lifting a 2000 pound car. To the nearest Newton, what is the lift force exerted by the air on the rotors? Homework Equations I thought since the problem is dealing with forces, I would use F=ma but that...

The thread title is meant to be "Can a fly lift a balloon", it's Tom now due to a small mistake while posting. This question was raised on a dutch technology forum. Specific: Can a fly in a balloon lift the balloon by flying upwards against the top of the balloon? More general: Can a flying...

Hi, I need a little help on figuring out what size square tubing and thickness I need to make a basic lift for taking the body of a car on and off of a frame. I have included a small drawing of what I am trying to build. I am going to need to support a maximum of 1000 pounds. All off the...

What is the maximum mass of rocks one can lift using a wheelbarrow PLEASE HELP! Homework Statement A man is using a wheelbarrow to transport rocks across the garden. The man can generate a maximal vertical force of 500N to lift the wheelbarrow. If the centre of mass of the rocks is .25m...

Hi there, i am working on a lift algorithm and i don't know how to implement it. can anyone pls code the program for me in ANSI C? i will be grateful for the favour. regards kautilya

A hydraulic lift has two connected pistons with cross-sectional areas 5 cm2 and 650 cm2. It is filled with oil of density 720 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1400 kg at equal fluid levels? 10.77 OK b) With the lift in balance with equal...

Urgent calculation: design a construction lift... the construction lift is used in a building construction project. the construction will raise building materials from ground level to any height up to 12.2m. The life will be at the top of a rigid scaffold that is not a part of the design...

can you please help me with this as i am confused? I am designing a frame for my project. I have a rod GF connected to rod AB at point F at 45 Degrees. The dimensions are mentioned in the attached word file. There is a weight of 1 Kg at side resting on rod AB nead end - A. what is the...

Homework Statement Question refers to the torque required to lift the nose wheel of an aeroplane A retracting nose wheel assembly is raised by the application of Torque T applied to link BC through a shaft B. The wheel and Arm AO have a combined mass of 50KG with a centre of mass at G. Find...

How do you calculate the force needed to lift an object?

Homework Statement a block of mass m = 20 kg is placed on the floor of a lift (mass M = 1000 kg), the lift is being pulled up distance d =25m by a cable, the normal force on the block FN has a constant magnitude of 300N, how much work is done on the lift by the force on the cable?Homework...

Homework Statement A hydraulic lift has two connected pistons with cross-sectional areas 15 cm2 and 460 cm2. It is filled with oil of density 560 kg/m3. Homework Equations a)What mass must be placed on the small piston to support a car of mass 1100 kg at equal fluid levels? A:35.86 kg...

Finding how high a "winch" can lift a mass before the battery discharges Homework Statement The EMF of the D cell battery is 1.5 V and the life is about 10 A/hr. 50% of the energy int he winch does actual work and the lifting mass is 50 kg. The winch has a load resistance variable of Rl...

Hello, I need to figure out the force I require to lift the water rocket that I'm building. It weighs about three ounces or about .0850 kilograms to possibly make it easier. How much force will I need to provide lift-off. Would I take the acceleration due to gravity (9.8) times the weight of the...

can compressed air be used to lift a load of 400lbs about 30 feet into the air i came up with using an air compressor to route compressed air into 4 small rocket nozzles to lift it off the ground how powerful of an air compressor would i need if i wanted a constant thrust of 500lbs coming...

Hi everyone what kind of wing & what kind of airfoil do you suggest if i want to have max lift & max L/D for my glider?

Just a question about heating compressed air.. I know generally how hot air works.. You heat it and particles expand and creates lift. So my question is, Does heating compressed air provide any lift? if so how much in relation to normal air? eg if I had 100m^3 of air heated to 120C...

Hey guys, I current picked up Fundamentals of Aerodynamics by John D. Anderson Jr. and am having a little bit of trouble understanding some of the equations i am given. This is the first aero book I've picked up so I am not too familiar with aero concepts or terms yet. On page 20...