A surface lift is a means of cable transport for snow sports in which skiers and snowboarders remain on the ground as they are pulled uphill. While they were once prevalent, they have been overtaken in popularity by higher-capacity and higher-comfort aerial lifts, such as chairlifts and gondola lifts. Today, surface lifts are most often found on beginner slopes, small ski areas, and peripheral slopes. They are also often utilized to access glacier ski slopes because their supports can be anchored in glacier ice due to the lower forces and realigned due to glacier movement.
Surface lifts have some disadvantages compared to aerial lifts: they require more passenger skill and may be difficult for some beginners and children; sometimes they lack a suitable route back to the piste; the snow surface must be continuous; they can get in the way of skiable terrain; they are relatively slow in speed and have lower capacity.
Surface lifts have some advantages over aerial lifts: they can be exited before the lift reaches the top, they can often continue operating in wind conditions too strong for a chairlift; they require less maintenance and are much less expensive to install and operate.
Hello everyone,
When you go down a lift, are you actually falling down. Is the lift carrying you down, or are you falling down due to gravity towards the lift, if the lift goes too fast would your head crash? Sorry if my thinking is completely wrong.
Ok now apparent weight is from the...
Hi,
Imagine you have an object where the weight is equally divided. What would be the formula to calculate the force needed to lift the object up to a distance without lifting it up completely. For example, a push-up, your feet keep touching the ground but you push your self up. How would one...
What's the equation for the force of a lift. Drag formula is 1/2 ρ∆v^2 C A. And if you need the constant how would i determine the lift constant for a semi circle shape which spins sideways and has an acceleration of approximately 8.5 m/s down (should be gravity which is 9.8 ms/s). It is...
Pretty simple question:
Is it possible to completely calculate Lift and Drag from the pressure distribution over an airfoil?
Atm, I have Lift worked out as well as the Induced drag ( correct me if I'm wrong. ) but am having trouble working out how it would be possible to get the skin...
http://www.harborfreight.com/1-2-half-ton-capacity-pickup-truck-crane-1647.html
I bought this truck crane for my father. How could i calculate the force needed on the handle to lift a given load? I could measure it but I am interested in how the math is done. For simplicity i'll assume the...
Simple pendulum is said to be not applicable if it's in the space that far from other planet which there're no gravitational field present.
Howerver when the system is inside a free falling lift, isn't the bob of the pendulum experience an accelration with value equals to g?
Is it correct to...
Homework Statement
How many cubic meters of helium are required to lift a balloon with 400kg payload to a height of 8000m where the density of air is 0.460kg/m^3 and the density of helium is 0.180kg/m^3. Assume that the balloon maintains a constant volume.
Homework Equations
\rho = M/V...
Homework Statement
If a man has an average useful power output of 41.4 W, what minimum time would it take him to lift fifty 15.0-kg boxes to a height of 1.88 m?
Homework Equations
1/2mv(final)^2 mgy(final) = 1/2mv(initial)^2 mgy(initial)
P=W/Δt
P=Fv
The Attempt at a Solution...
Homework Statement
Using sketches and equations briefly describe how Bernoulli's equation and other factors cause lift force to be generated by a wing.
Homework Equations
The Attempt at a Solution
I'm struggling to find anything else that causes lift except bernoullis! please help!
Homework Statement
A light spring force const. k hands from ceiling of an accelerating lift with a block of mass m attached to its bottom end. Block is held stationary (in lift frame) with the string at its equilibrium length while the lift is accelerating at a rate Ag where A is between -1...
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
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...
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...
Homework Statement
Using a wind tunnel, I recorded lift and drag forces on an object and now I want to estimate where the object will land based on these forces. When I took the data from the wind tunnel, I changed the angle of attack at 2 degree increments from -10 to 30 degrees. This was...
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.
I am having a lot of trouble conceptually understanding this issue in Lagrangian mechanics:
I have an airfoil which is immersed in incompressible flow: it has two degrees of freedom: a rotation: alpha and a pitching (up down) motion: h. Now the lift is due to both alpha and the first derivative...
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...