Lift Definition and 614 Threads

I am building a lift using 4 threaded spindles and sprockets to travel 12 feet. The motor needs to have 56 mount as it will be mounted vertically (Shaft down) attached to a sprocket that drives a chain to the 4 supporting sprockets. The load (1,000 lbs, 250 lbs at each corner) will be lifted...

I'm trying to figure out what type of motor I need to use that has the ability to lift a 7'-9' pole that has about 5-8 pound weight attached to it at the end. The max angle that the poll will be is 180 degrees and the motor will need to lift it to 90 degrees. As for the weight its not a free...

Is there analogous "lift" in quantum field just like air can produce lift in aerodynamics. I just rode an airplane and thought that prior to the wright brothers.. people never thought machines can be heavier than air.. then the principle of lift was discovered.. is there a counterpart in the...

Hello everyone, I am working on a 3.2 meter wing span electric aircraft with another group of 30 engineering students. In calculating the induced drag and lift for preliminary calcs I am a little confused as to whether I need to include the width of the fuselage in the wing span(b) for induced...

Hello all! I'm an electrical/controls engineer by day and farmer by night. I need some insight on an issue I'm having at the farm. We have a greenhouse where I've setup automatic temperature controls. A small PLC reads temperature in the greenhouse. If the temperature gets too high, we open...

Hello, My question is simple. Let's suppose you have an electromagnetic coil with a magnetic weight in the center of it. This coil is energized, and the weight is lifted up vertically. Now, my weight is 30 kgs. I want to lift it to a height of 1 meter. How do I calculate how much power is...

I just started reading general theory of relativity. I have some elementary questions. Not an english speaker so bear with me. I am reading the thought experiment which describes path of a photon in a free falling lift. For an observer inside the lift, the photon path is a straight line. But...

Doug Mclean talk about common lift misconceptions.I agree with most of what he said but he claims that downward air flow "downwash" do not exist because integral is zero. I don't agree with this statement,leave mathematics and see what happening in real world. Downwash evidence: What do you...

Homework Statement An object of mass 1000 kg is lifted by means of a steel lifting cable being wound round a drum of diameter 2.5m mounted on a horizontal shaft. The drum and shaft have a mass of 1000 kg and a radius of gyration of 1.0 m. What is the torque required to give the object an upward...

Homework Statement Consider a ball of m = 0.50kg. Does it take the same amount of additional energy to vertically lift it from 15cm to 25cm as it does to lift it from 25cm to 35cm? If not, which takes more? Why? Homework Equations Potential energy: mgh Work = Kf - Ki The Attempt at a Solution...

Homework Statement A hemispherical dome filled with water, radius 2 m and weight 30 tons, can be lifted by giving it a constant angular velocity around its vertical line of symmetry. The dome has a hole on the top. Decide the minimum angular velocity. My answer is 2.91 rad/s . The correct...

would an air check valve help lift by preventing air presure backup through the lift fan?

Hello everybody, I have a crazy idea in my mind, and I need help of someone who knows about physics ! I was wondering if it could be possible to lift a human body with fans on the ground. I know about vertical wind tunnel (indoor skydiving), but I thought more of a compact and homemade system...

Homework Statement When a mother lifts he child with her foot (as shown in figure) what force should the upper muscle exert to lift her child at a constant speed? Homework Equations W = F x D f = mg I think these might be the right equations to use, correct me if I'm wrong. The Attempt...

Hello, I'm trying to find situations in which it is important or useful to look at the force generated by a difference in pressure due to an increase in velocity of a fluid. I.e, pressure changes due to Bernoulli's equation. This should be simple by itself, but I am looking for situations that...

1. Part One: A mass M1 = 30 kg is suspended by a light string from the ceiling of a lift of mass M2 = 300kg. If the lift accelerates upwards at 1 m/s2, what is the tension in the lift cable and in the string? (g=9.8 m/s) Part Two: If the string breaks when subjected to a tension of more than...

Hello! I have a scissor lift which was http://www.pentalift.com/lift-tables/scissor-lifts&multi-stage.php in 2002. It's been working perfectly until last week. Last week when I tried to lift it with 3 people on it, it didn't go up entirely. We used to lift up to 6 people on it, but now it's not...

Mr lee said: ↑ hi -new but enjoyed years, wit and wisdom Flettner rotor on a boat - ie. magnus effect Can the vertical rotor create lift? a curve balls 'laces' exaggerate and bend the magnus effect. can you replicate this effect on a rotor? --perhaps to enable another direction of force-- up...

Both involve water resistance, buoyancy, and density of water and air. Therefore, I would expect that the lift up of your foot would be easy but putting your foot down would be the most difficult. Lifting an object is easier bc of buoyancy force. Although, apart the object must be buoyant...

Maybe there are some questions like this... But I would like to listen to your answers... Thank you! As many people say, there are many ways that describe incorrectly the generation of lift. Two models survive today which are supposed to explain this aerodynamic force, or at least, a part of...

Dear friends, I am stuck at the following probability problem. Will appreciate your help. An office block has five floors (ground, 1, 2, 3 and 4), all connected by a lift. When it goes up to any floor (except 4), the probability that after it has stopped it will continue to rise is 3/4. When...

May I start by saying hello to all and that I have visited the site before, but have yet to create an account until now. With that said, I am having difficulty calculating proper numbers for a project I am designing. Mind you, it has been about seven years since I was in any physics or...

Hi, I am working on a product design which would be used sub sea. It is designed to lift a small load off the sea bed. I have not worked out the exact details yet but the following should be a good start: Load 30Kg Depth 30m I plan on using an air bag of some description - the bag needs to...

Homework Statement Hi, this is not really an academic homework but it is something I'm trying to solve for my future project. I have a background in electrical engineering hence I'm having a hard time solving the forces problem. https://dl.dropboxusercontent.com/u/43124243/Force_problem.png...

Hello everyone! I'm new here and I have never been too good at physics, but now I've been trying to revise for the MCAT and I have stumbled across this question in "Kaplan MCAT Physics and Math Review": If you have and object three times as heavy as you can lift, how could a lever be used to...

I need an equation that solves for the height of a projectile at a specific x position. The known variables are spin of the ball, initial position, initial velocity, initial launch angle and the drag and lift coefficients.

does that affect the equivalence principle?

Homework Statement A ski-lift has a one-way length of 987 m and a vertical rise of 275 m. The chairs are spaced 21 m apart, and each chair can seat three people. The lift is operating at a steady speed of 14 km/hr. Neglecting friction and air drag and assuming the average mass of each loaded...

I'm trying to design a solar heated (non electrical pump) ..but by theory when we are lifting water by using vacuum and atmospheric pressure the weight of water after rising 10.3 m is equal to the atmospheric pressure created by vacuum ,so they cancel out..so is it impossible to lift water using...

I was asked how you can lift the water up to 5 meter but you are not allowed to use any kind of pump. What I thought; seal the container from where water is being lifted. Connect it with a pressure vessel at some height which is containing steam and water with valve in between them. By default...

In the attached picture, can I say that there is a lift force in the Y-direction, and a drag force too in the same Y-direction? FL proportional to V_fx2 ? FD proportional to V_py2 ? Is this equation of motion for the Y-direction correct here: ma = − mg − FD + V(rho)g + FL The lift force is...

I need a reference for the exact solution for lift at high angles of attack, when an airfoil behaves like a flat plate. I am pretty sure the theoretical solution is CL = 2 sin(α)*cos(α) based on two papers I read on lift through 180 degrees angle of attack, but I can't find in any of my books...

Hello, I was doing my physics coursework, and blew a hairdryer at my makeshift aerofoil across distances of about 10cm and wind velocities of 8-11 m/s, then measured the lift off of a balance. I found they were proportional, exactly (!?), after doing some research I found drag is proportional...

Homework Statement A pneumatic lift system is being demonstrated at a sales show. The total load is 70 kg, and the lift piston is 15.2 cm in diameter and has a 20.2 cm stroke. A portable air bottle with an initial pressure of 20 MPa and a temperature of 23 Celsius degrees is to be used as the...

Hi! I have attached a small sheet of wood to a stand and then all of it to a scale. After that with a air supply I've made wind go through the "wing". Due to lift, the scale showed up a negative value. Knowing that value, is it possible to calculate the lift of the wing? Thank you

Hi Everyone, I work with rotative gas lift systems, sizing the compressors (recip´s), I'm not that familiar with the oil well, though. I have a doubt regarding the gas flow going to the well. There is a new well which currently produces 0.4 MMscfd of gas and the client wants the system to be...

For an airplane, their are multiple types of lift, camber, angle of attack, pressure difference, and vortex lift. I understand that at the end of wings the low pressure at the top, and high pressure on the bottom causes their to be a vortex formed. My question is, how exactly do they use that...

The thrust of an airplane changes the speed of the airplane, or you can look at it as it is increasing the airspeed relative to the airplane. The airspeed across the wings is only as much as the thrust allows it to be. The airspeed across the wing is what produces thrust, and I realize how it...

Hello all, i recently purchased a travel trailer, and i want to create a lift to get inside it. a little background on me, i was in a motocross accident, broke my back and am now paralyzed. I currently work at a full fabrication shop as a mechanical drafter, we have the capabilities to make...

Homework Statement A wire of mass 3.0g and length 60cm is placed on a table parallel to the East-West direction. If a current flows through the wire from West to East, how large must the current be to cause the wire to lift off the surface of the table? (The Earth's magnetic field has strength...

Homework Statement This is a video of the phenomenon. Start at 5:08 in this video and watch the next two crashes. That first one, where the car hits a wall, straight on, is the most helpful. The phenomenon is that when a car going uphill crashes, it has an upward speed/momentum vector...

Lifts/elevators of traditional design (i.e. not of the "gearless" type, like Kone's EcoDisc ®) are driven by a hoist that uses a worm drive gear between the electric motor and the sheave. The drum brake is always mounted on the motor shaft (high speed). As you know, worm drive gears are (except...

I was researching Telsa turbines and was intrigued by the bladeless design where gases drag on the discs by means of viscosity and the surface layer adherence. As the discs are rotated by the gas, the gas slows down and exits through the center of the disc. I was wondering if we had two shafts...

Hello, I'm brand new to this site. I have a number of questions that I can't get answered by anybody. I want to some how create negative pressure under the car to suck the bottom of a car down using Vacuum fans (like the 1970 Chaparral 2J Can-Am racing car ("sucker car"). I has some basic...

Please go to this Wikipedia article on Lift Coefficients, and behold the first formula. The last part of the equation has a "S" which is supposed to stand for "relevant plan area". Now, there was no explanation of what this "relevant plan area" is or means. I was guessing that it means the...

Hi, I'm trying to solve this problem and it's driving me a little crazy. Any help greatly appreciated. Q) A lift travels to the top of a tower through a vertical displacement of 48 m. The total journey takes 17 s. The lift accelerates from rest at a constant rate for the first 5 seconds. Then...

Homework Statement A model airplane has a small gas powered motor in it to allow it to fly. It is tethered its controller by a long cord. The plane will fly in a circle at the end of this cord around the controller who uses the tether to control the altitude of flight of the plane. Currently...

boneh3ad submitted a new PF Insights post How Does an Airplane Wing Work: a Primer on Lift Continue reading the Original PF Insights Post.

Hi all, first post here. I'm currently faced with an assignment in a class where we really haven't been taught anything and have to figure it out on our own. We've been asked to design an industrial lift system to raise approximately 3000 kg up 25 stories. I have done a lot of research and...

If i am standing on bathroom scales and i lift a weight, what will it do to the reading on the scales? I assume that lifting the weight will involve a force from my arm on to the weight, and an equal and opposite force will then push back, causing be to weigh more?