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.
I am interested in this Hobby.
I have seen several experiments and it looks pretty easy to do.
I am wondering what exactly lifts this?
Is it Ions or ??
They had done a test in a vacuum chamber and it was still working, are ions present in a vacume?
If it's not ions, then what makes the...
Homework Statement
A hydraulic lift has two connected pistons with cross-sectional areas 5 cm2 and 550 cm2. It is filled with oil of density 520 kg/m3.
a) What mass must be placed on the small piston to support a car of mass 1500 kg at equal fluid levels?
this was no prob.
=13.61...
Homework Statement
A hydraulic lift has two connected pistons with cross-sectional areas 5 cm^2 and 550 cm^2. It is filled with oil of density 520 kg/m3.
a) What mass must be placed on the small piston to support a car of mass 1500 kg at equal fluid levels?
Homework Equations...
I think this is a pretty simple question but I can't seem to figure it out:
If there is a 90,000 kg building (20 m deep, 10 m long, and 10 m wide) on the surface of Saturns moon, Titan, how fast does wind have to blow over the top to have the structure become "weightless" (the air below the...
When an air passes over the wingtip of the airfoil, the upwash created at the leading edge 'reduces' the Angle of Attack, thus reducing lift. So why does this affect increase induced drag. The way I understand it, the greater the AoA (more lift), the more induced drag that is generated.
Help...
I've just finished the practical part of an investigation into lift and angle of attack. I also took airspeed readings over the top and bottom of the wing at the leading and trailing edges.
What I'm having trouble with is grasping how lift is generated. I understand the underlying principles...
Homework Statement
How much tension must a rope withstand if it is used to accelerate a 1400 kg car vertically upward at 0.50 m/s2?
Homework Equations
Fg=mg F=ma
The Attempt at a Solution
So far i know Fg=13720 and the Fnet is 700 so I'm not sure but do i subtract 700 from 13720?
Homework Statement
Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 269.0 kg. What must be the minimum diameter of the spherical balloon?
Homework Equations
p = F/A
The...
Ok, propably everyone here knows that IN THEORY it is possible for a human to fly. This question has been bugging me a lot and I know it can be solved using some kind of aerial physics (Dont know the term :D).
Therefore my question is: How fast must 75 kilograms weighing human wave his hands...
Homework Statement
A rod is being used as a lever as shown. The fulcrum is 1.2 m from the load and 2.4 m from the applied force. If the load has a mass of 11.6 kg, what force must be applied to lift the load?
____ N
Homework Equations
?
The Attempt at a Solution
When doing...
I understand how an ordinary wing works but I cannot find anything on how a delta wing works, the only thing I know is that it creates vortices on the upper wing surface, but how do these vortices create lift?
Homework Statement
Hey everyone, this problem has been bugging me for days now, and no matter how many times I've attempted it, I feel like its going wrong.
http://img258.echo.cx/img258/4409/lift3ad.png
The buillder has a mass of 75kg and the cradle has a mass of 35kg. The builder...
Homework Statement
I have recorded raw pressures for from a wind tunnel for a NACA 0012 airfoil with 30 surface pressure taps.
I have computed Reynolds Number for 3 angles of attack.
I have computed the Pressure Coeff. for each pressure and graphed them verses the non-dimensionalized...
Is More work is done to lift a 4.00-kg object a distance of 1.00 m at a constant velocity than to push a 1.00-kg block a distance of 1.00 m with a force of 39.2 N?
I can find the work done in the 2nd case using W=fd= 39.2 J.
Homework Statement
A 5400 kg helicopter accelerates upward at 2.17 m/s2. The acceleration due to gravity is 9.8 m/s2. What life force is exerted by the air on the propellers? Answer in N.
Homework Equations
Fnet=ma
The Attempt at a Solution
I am making the acceleration positive...
Anyone know how long a typical let's say news helicopter can last in the air given how much fuel it holds?
I am not sure but I heard a news helicopter or a police helicopter probably won't last more than 3 hours in the air.
Some military transport helicopters can only do about 2 and attack...
Homework Statement
1)
Consider the hydraulic lift which has a smaller piston of area A1 and a larger piston area A2. Initially the two pistons are not moving.
Show that in order to raise the larger piston by a distance d2, it is necessary to apply a force △F = ρg(A1 + A2)d2 on a smaller...
As a helium balloon increases in altitude, the density of the air inside decreases. However, the density of the air surrounding it (The atmosphere) also decreases
with altitude p=p0*exp(-z/z0), where z0 is the scale height of the atmosphere. So does this mean the lift force acting on the...
Can anyone point in the direction of any information on dry lift testing for turboshaft fuel pumps? I need to write a good practices guideline for this and need to find as much info as I can.
Thanks.
I came accros this question while reading a bit of Logic and i was wondering what you guys think about. If Zeus can do anything can he make a stone he cannot lift?
Hope its not too trivial.
thanks
Hi,
i have to find a formula for the coefficient of lift that has the angle of attack and wing shape (airfoil shape) in it. Also, where can i find airfoil shapes for different planes?
Thanks
A small body is released so that it falls to the floor of a lift moving downwards at a constant velocity. How would the acceleration of the body as observed by someone in the lift compared with that observed by a person stationary with respevt to the lift shaft?
Homework Statement
A pulley system has an efficiency of 76.9%. The acceleration of gravity is 9.81 m/s^2. How much of the rope must be pulled in if a force of 620 N is needed to lift a 52 kg desk 2.32 m?
Homework Equations
Force = ma
Work = force * distance
The Attempt at a...
Homework Statement
given, diameter and height of pool, depth of water, density of water and gravitational acceleration.
g = 9.8
height is 4m
2r = 20m
depth of water = 3.5m
density =1000kg/m^3
So, I'm supposed to find how much work is needed in joules to lift the water out of the pool...
is the formula below valid to calculate the lift coefficient for a delta wing?
Cl=2*L/(rho*v^2*A)
L=lift (N)
rho= air density
v= air velocity
A=wing area
im doing a subsonic wind tunnel project where I am going to measure the lift for a low aspect ratio delta wing. should i use...
:redface: 1. i need to design an electro magnet that can lift a 1 Kg weight vertically with the minimum cost possible ANYONE GOT ANY IDEAS and i need it to be very presize i mean the measurements thanx
Hi i am new in this forum, and i have a paper on aerodynamics, which is a bit general...
Basically the paper is on how to affect lift and drag in automotives...
could you help me with this...
thanks
Homework Statement
balloons are required to lift 20 metric tons. the pressure of helium is 101.325kpa. temp=21.1degcelsius.
what should be the diameter of the balloon if it was spherical in shape in order to lift the weight?
Homework Equations
bouyant force??
The Attempt at...
Hi, I'm currently doing a research study on the effect of the presence of a rear car spoiler on the lift of a vehicle at low speeds
As far as my understanding, with an increase in air velocity, there should be an increase in lift on the car. My trials however show that with an increase in air...
1. A T-bar tow is required to pull 89 skiers up a 600 m slope inclined at 15° above horizontal at a speed of 2.5 m/s. The coefficient of kinetic friction is 0.06. Find the motor power required if the mass of the average skier is 65 kg.
2. w=F*d
P=F*v
3. I found the...
Work to lift the weight??
A 1000-lb weight is being lifted to a height 10 feet off the ground. It is lifted using a rope which weighs 4lb per foot and which is being pulled up by construction workers standing on a roof 30 feet off the ground. Find the work done to lift the weight?
Hi,
I have a question regarding the forces involved in an inclined elevator boat lift. Attached is a diagram of the setup. I was wondering what forces are involved. I know that there is a torque that is exerted on the inclined arm equal to the weight of the boat times the distance of the...
Homework Statement
A lift in free fall with Dr. Bhargav inside. In order to save his calculator he throws it up with 1 m/s from 1 meter above the floor of the lift. It reaches the sealing in two seconds. Calculate height of lift.
The Attempt at a Solution
As the wt in free fall=0...
Homework Statement
What is the net upward force on an airplane wing of area 20 m2 if the speed of air flow is 300 m/s across the top and 280 m/s across the bottom.
Homework Equations
The Attempt at a Solution
I have a feeling that this is an easy question, but i just don't know...
I am trying to build my own boat lift that uses plastic tanks submerged to lift the boat when they become filled with air. My problem is that I need to lift about 10,000 lbs and i don't know how large the tanks need to be ( how much water they need to displace ) to lift that amount of weight...
How would a lift accelerating upwards affect the shape of the flame of a candle in it? My instinct says it would flatten it, but I'm not sure how to explain why. Any help?
i was reading on the moller skycar which has multiple wankel rotary engines powering ducted fans for lift, i was wondering if anyone had any information on how many pound of lift one of these engines on a regular ducted fan would have
Need some suggestions...
I have a banked airplane at theta degrees, with a radius, and velocity. What is the formula for finding lift force. Fc = Fn sin theta I believe, but that's the only formula I am aware of. Thanks!,
-Mike
Hi I've got a question concerning a previous question I've done. A person is holding a toy airplane which flys in the air with a constant radius.
is the lift force the same as reaction force?
is it equal to the vertical component of the centripetal force and weight force of the airplane?
A 4600 kg helicopter accelerates upward at 2.0 m/s^2. What lift force is exerted by the air on the propellors?
I don't know how to do it.
Please help :confused:
Hey here is a quick question. I have a question on an assignment that is asking me to define lift in an aircraft (done) and its relationship to the aircraft's centre of mass. I'm unsure how to do that second bit as lift acts through the centre of pressure...not the centre of mass (also known as...
In an TV advertisement, a young man was lifted by an artificial spring water to a hight about 4 m. Supposed the man's weight is 800N, and the sectional area of the spring water is 0.2*0.2 m^2, and using the impuse-momentum theorem, I got a velocity of the spring water of 4m/s.
Is this correct?
I have another question maybe someone can help me with. I have attached a drawing of a beam (tube) that is 42" long and weighs 50 lbs. The beam pivots at one end (red dot). If the beam weighs 50 lbs how much force is required to lift the beam to a vertical position if I apply force at a 45...
Is lift essentially created because of higher pressure at the bottom of the wing compared to the top of the wing, causing a postive net upward force?
With PA=F
And the difference in pressure is created from lower wind or fluid speed at the bottom of the wing compared to the top of it...
Hi guys,
I've heard that this topic has been discussed to death before but hopefully not here yet I apologise if it has been.
I'm currently in high school we're just into bernoulli's equation and one of the applications is the airfoil. Our textbooks states that the fundamental source of...
the force of lift excerted on an airplane is defined as
F = Lc * D * v^2 * A
where Lc is the lift coefficient, D is the air density, v velocity, and A the lift area of the wing structure. If i use SI units, the Force is expressed in Newtons.
What I'm trying to grasp here, is how does this apply...
emm, i m new member here
maybe i m stupid and young enuf to ask these question, but i seriously nid help from u all to explain to me
1st, if we standing on a weighing machine in a lift, when the lift accelerate downward, the reading of W.M. wil decrease?and when accelerate upward the reading...
Hi, i am currently doing a project on these questions.
1)why do we feel heavier when the lift startes to move up?
2) why do we feel normal in the middle?
3) why do we feel lighter when the lifts comes to a stop?
although i know that the three laws of Newton is somehow related to...
if an aircraft with a coefficient of lift of 0.05322 is traveling at the velocity of 240 kts at sea level, how much lift is required to fly at level unaccelerated flight if the aircraft weighs 800 lbs? (hint: trick question)
If I take an infinitely long, thin wing and measure its lift curve slope I should get 2pi.
Now if I take a 1/2-wing and fit 1 end to a plate and test it in a wind tunnel, it should simulate the flow around a full span wing, am I wrong? Therefore measuring lift and working out the CL values...