Lifting Definition and 247 Threads

Hi, Reading about different ways to lift a human being, I've come to realize the easiest is simply manipulating density as follows: Denisty of Air at STP: 1.20 kg/m^3 Density of He at STP: 0.000179 kg/m^3 Therefore for every cubic metre (m^3) of air displacement, lift achieved is ~1.2 kg/m^3...

Hi all, So I was thinking about how you could calculate the calories burned when lifting weights. The actual energy requirement should be simple enough if I'm not mistaken : Amount of weight in kg * distance traveled per repetition in m * g constant * number of reps = Joule expenditure Then...

Hello! First post, hope you all can help me out. I’m a peace corps volunteer in Nepal and am trying to implement drip irrigation for my school garden, since this season, we get water for about 30 minutes in the morning through a tap that is “always open.” The water that comes has some pressure...

Hello! First post, hope you all can help me out. I’m a peace corps volunteer in Nepal and am trying to implement drip irrigation for my school garden, since this season, we get water for about 30 minutes in the morning through a tap that is “always open.” The water that comes has some...

Homework Statement From a physics multiple choice test: "A car is raised to a height of 10 meters. The car is at rest both before and after it has been lifted. The mass of the car is 900 kg. The total work that has been done on the car during the move is" (The right answer is: zero). Wnet...

I understand that you need to increase the pressure in an IV bag to overcome the pressure in a vein so fluid pumps into it. But why does lifting the bag at some height increase the pressure?

This may sounds like a stupid question but... If you were to use a subsea lifting bag filled with O2 it would rise to the surface. Would the same happen with CO2? I assume the density of CO2 is different so the amount required would be more or less than O2, but it is still less dense than...

Homework Statement Hi There, I'm having trouble understanding (what I guess should be) a simple concept and so I can't apply it to a project I'm working on (also kind of rusty on torques and mechanics problems) If I have a hinged beam (of uniform weight) and I lift it from one end and stay...

Hey guys, I'm a super amateur at physics, but I occasionally like to calculate random problems that pop into my head. Today I was thinking about pascal and hydraulics, and wondered if I could devise a (hypothetical) hydraulic system that would allow my weight to lift an elephant. I want to...

Is there a way to determine how many amps / watts is required from an electric motor in order to move (lift, push or pull) an object weighing a specific amount? Conversely, is there a way to determine the maximum amount of weight an electric motor can move (lift, push or pull) based on its...

1. Homework Statement Hello all. It is not a homework actually. I just didn't know at which forum I should post. I am working on a MATLAB code solving the finite wing properties iteratively by using the Anderson's Numerical Lifting Line Method. However, I got some wrong results. The...

Pretty neat. Lowe's is equiping some employees with these exoskeletons to help them lift in their jobs with less overall strain on their backs. Virginia Tech is working with Lowe's on the design and testing of the exoskeleton "uniforms". :smile...

< Mentor Note -- thread moved to HH from the technical math forums, so no HH Template is shown >[/color] I've encountered 2 problems in a row that involve lifting water out of tanks and finding the work needed. I am getting the incorrect answer. w = ⌠ab pgA(y)D(y)dy here is one of the...

http://lookpic.com/O/i2/73/DYktKEGg.jpeg Hello Dear Friends We produce Lifting Electromagnet for Steel Scrap charging of Induction furnace, bottom plate of electromagnet is made of Stainless steel . my question : Can We use AL OR SILVER Spray for Spraying bottom plate that Radiation heat...

Hello folks, I am new to the forum and have read threads on different topics that have help me out with problems with my projects. Each of the threads I read everyone was helpful and friendly, so I decided I would try with one of my own problems. I read one thread that has given some of the...

If I want to lift a car of 1500 kg with a air compressor and with 50 nozzles, what should be the size of nozzles and what should be the pressure of air compressor and at what pressure will the air come out through nose so that it could be easily be lifted.

Homework Statement The question is: A 2 litre cooking pot (diameter: 20 cm, mass: 300g) is closed with a tight fitting lid, and contains only air. What mass of air can be maximally in the pot so that you can lift the lid, and the pot will move with the lid? Assume the surrounding pressure is...

As I know, lifting force is because the surface of upper side of the airfoil is longer than the bottom side, causing the pressure of down side larger and produce lefting force... this is a picture from my lecture notes, which the instructor didn't explained but seems contradict to what I knew...

I read the responses in "Lifting one end of a beam" and presume my situation would be similar but not quite the same. A beam would have uniform mass throughout but a canoe probably doesn't. My question: If one end of a 70 pound (15 foot) canoe is sitting on the ground and I pick up the other...

[mentor note: moved here from another forum, hence no homework template.] A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 3.00 m long and weighs 372 N. At a certain instant, the worker holds the beam momentarily at rest with...

I am confused about something and can't seem to put things straight in my head. Working with my students we were trying to calculate the work done in one repetition of an exercise like a bench press or a push up. Some students measured the distance the weight moved and the time it took and then...

Hi I one of my application i am using the lead screw arrangement to lift 200kg weight using handle I used trapezoidal thread and nut. Could anybody suggest the diameter required for lifting the weight of 200kg

Hello! I wish to do a lifting analysis in Ansys workbench. Basically it is a wagon with a train on it. I wish to analyse what happens to the model when lifting the wagon which has the weigth of the wagon+train. What is the easiest way to analyse what will happen to the wagon when lifting it...

Homework Statement A crane lifts its 500N load to the top of the building from A to B. Distances are shown on the diagram. Calculate how much work is done by the crane Known variables: AB= displacement= 50m AC=horizontal distance=30m BC=vertical distance=40m 2. Homework Equations Work...

I can't convince myself that the situation in this picture is possible in reality though I know the physics works. I feel that it won't work as the workers are not glued to the platform can anyone find a demonstration to verify it .please (I'v searched youtube as much as I could) people lifting...

Hi folks, I'm a construction worker helping to destruct an oil platform out in the north sea, I often have to work out weights applied on lifting slings during cross hauling scenarios like the one drawn here, I know 2 ways of working this out already; 1 using a calculation of all the triangles...

Hi, Suppose there is a very thin square tile set evenly on the floor such that one corner is at the origin, (0,0) of an xy plane. The tile is 1 x 1 units and thus, the corner of the tile opposite of the origin is at (1,1) on the xy plane. Suppose the corner of the tile at (1,1) is grasped and...

My question is, for the diagram attached. The set up is: 1. The object (gray), including the handle , weighs 2000 Newtons 2. The object is not open to the water below it but there is an air pipe that allows for air above to fill in the pipe 3. The object is snug against the wall (in black), so...

Hi. First Post. I'm a DIYer with no physics education, so I apologize in advance. I have a ladder 100 inches long that weighs 72 lbs. The top of the rails of the ladder are attached to hinges on a ceiling beam/loft floor joist 90 inches above the first floor. The run is 45 inches. I...

If I lift a ball of mass 5 kg from ground level to 1.5 meters above ground level and then throw it from this point up to a height of 10 meters, what is the work done by me on the ball? Is the following the correct way to solve this problem? Person only applies force to the ball for 1.5 meters...

Hi, I am trying to design a lifting platform for light duty loads (3d printing build platform) that only uses rotation for its actuation. I have a design that uses a mechanism similar to the slider crank and I want to maximize the total height the platform can travel. This is a sketch of my...

hello. I have a ejection mold (steel) which has a bridge like mount which locates the handling eye bolts outward around hydraulic cylinders. I need to make sure the bolts in the bridge will not shear due to the sideways load when the mold is lifted or flipped 90degrees. Here is the known...

Homework Statement Mr Bean – Mind the baby (19:45) In the film we see how Mr. Bean air puts a stroller with a baby in with the help of a number of helium-filled balloons. Appreciate the reasonableness of this! 1. What is the density of helium and air? 2. What do you think a stroller...

Hello all, This is the situation: a pipe, shown in de drawing below, is lifted at a constant speed of 1m/min. The pipe is closed at the top and open at the bottom. For obvious reasons, a ventilation hole is required at the top. The intention is to lift a minimum amount of water, in other words...

I have a question. Suppose a man is lifting a Mass. The mass of course pushes it down. Now what is the force the mass is applying to hand of man is it Weight or Force of gravity because weight acts on mass itself. Then what we call it precisely?

Hello everyone, I am trying to understand a center of gravity question regarding an object that is being lifted. I have a part that has a lifting circle that is used to put a hook through to hoist. The part needs to slide onto another part's surface that is about 30 degrees above the...

According to work formula $$ W = \mathbf F\cdot\Delta\mathbf x $$ and $$ W = F\Delta x\cos\theta $$ If an object falls: F = Gravitational Force = negative Delta x = Final Position - Initial Position = negative ==> (Like 2 - 5 = -3 ; because it is falling) cos 0 = 1 ==>(because x and F have...

Homework Statement Ringling Brothers Bamum and Bailey Circus is using a pulley to lift an Elephant on to a ship. If the Elephant is 2200kg and you have to raise her 15m with a pulley that has an efficiency of 60%, then how much rope do the handlers, who can pull with a combined force of 115 N...

hi ya'all i am not in technical and not a student. just want to do a small project on my own for my small farm. ' what i want to do : 1. a lifting device to lift about 100 kg up - about 350 mm 2. then it will lower it down and the hold it in position ( need to press at this point,means exert...

I was reasoning about prandtl's lifting line theory. Now, a lot of books state that if the the circulation changes across the bound vortex filament a vortex sheet of the same intensity must be shed from the filament following the wake. Is this a consequence of the helmolzt theorem that forbids...

Assume a strong permanent magnet is suspended by a string over a metallic object. The magnet is slowly lowered until the object is attracted to the magnet. For this to occur the object acquired both kinetic and potential energy. Since the object comes to rest upon hitting the magnet, I assume...

If the magnetic field strength is measured to be X Tesla on a large flat permanent magnet is there a standard formula for determining the force the magnet will supply as a function of distance from a piece of metal with well defined properties. I see the problem of different metals are going to...

Homework Statement http://tinypic.com/r/24mua0h/8 Homework Equations I've done all parts except question 3, which I'm not sure. is it because the fulcrum is providing an upward force to keep the load in the air? The Attempt at a Solution

Okay so 8n college I majored in math but throughout my education never had a real physics course. Now I currently have a labor j9b lifting boxes. At the warehouse we separate heavier boxes based solely on wieght and not size. So I was wondering does (assuming wieght is equally distributed) does...

Is there torque involved when you to lift a pot from table level to the level of your mouth. Because somebody (kaitlyn richelle) mentioned in her blog about lifting a pot and how she lacked torque.

Homework Statement Flying aircraft X is designed in 2014. The current model has a top speed of 812 m/s, a mass of 72,000 kg when fully loaded, and a maximum thrust to weight ratio of 0.44. Calculate the lifting force and the drag coefficient for the Quinjet when it is flying level at top speed...

Homework Statement A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.26 m long and weighs 397 N. At a certain instant the worker holds the beam momentarily at rest with one end a distance d = 1.21 m above the floor, as shown...

A 10 kg monkey climbs up a massless rope that runs over a frictionless tree limb and back down to a 15 kg package on the ground. Part a) What is the magnitude of the least acceleration the monkey must have if it is to lift the package off the ground. Professor's solution says:The force the...

Homework Statement A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the...

Homework Statement A worker is trying to lift a 100lb bucket. Assume that the bucket is in static equilibrium as it is raised from 2ft to 18ft. Find the tension in the rope as a function of y. Homework EquationsThe Attempt at a Solution I solved for angle, a, which cam out to be...