Lifting Definition and 247 Threads

Dear Experts, I have vessel with lifting lug attached to the shell. Vessel weight = 1681.84 N How to calculate:- 1) vertical force 2) nominal radial force 3) horizontal force

Homework Statement I have a brick of mass m in my hand. I move the brick vertically up h meters. Homework Equations What is the Work done to the brick by gravity? The Attempt at a Solution Work = Fd The F for my hand on the brick is mg going up and d is h so the work done by my...

Homework Statement a woman is straining to lift a large crate with no sucess. its too heavy. we denote the forces on the crate as follows: P is the upward force on the crate by the person. C is the contact force on the crate by the floor and w is the weight. how are the magnitudes related...

Homework Statement If the calorific value of wood is 16 MJ/kg and a match weights approximately 0.17 g, then (a) how much energy (in joules) is released by burning the wooden part of a single match? If all of this energy were applied to do work to lift a 60 kg human vertically, against...

I'm working on a basic 2D-"panelmethod" program. Currently it's "no-lift" but I would like to expand it to lifting bodies. The routines I'm using are loaned from my litterature and the program is working just fine for non-lifting bodies. It uses sources distributed over the panels to...

Homework Statement A student has six books, all of them with a 4cm thickness and a weight of 30N. ¿What would be the minimum work to put the books in one pile, if the six books are in a table? Weight: 30N Thickness: 4cm. Gravity: 9.81ms-2 Homework Equations Ep=mgh Ec=(mv2)/2...

I need help on this proble: A student has six books, all of them with a 4cm thickness and a weight of 30N. ¿What would be the minimum work to put the books in one pile, if the six books are in a table?

Homework Statement A uniform rope of mass \lambda per unit lengt is coiled on a smooth horizontal table. One end is pulled straight up with constant speed v0. a. Find the force exerted on the end of the rope as a function of height y. b. compare the power delivered to the rope with the...

Homework Statement say you have a 240kg rectangular mass it is pulled upwards by two cables symetrically since force due to gravity is 240g so each cables would have to produce 120g each to lift the mass. but the resultant force sum to zero so if we were just given a FBD of the...

I was wondering if someone could answer the following question please. Is it possible,that if the Earth's magnetic poles were to swap, this could force a shift in the human computational abilities which would cause our emotional based society to become greater processing agents from the...

I am wondering what would happen in the following scenarios? I am not looking for exact numbers, but generalized results. Say I have a rigid buoy that has a volumn of 2 gallons. I have a swimming pool or other large body of water. I have the buoy at the bottom of a ten foot deep pool...

Hi everyone, I was looking for a std to calculate stability of truck mounted crane. Recently I found an australian std "australian code of practice for crane installation on truck" (I think it is a part of 1418 au std), and I found it simple and practical. But, when I tried to solve the example...

Hello, I have a question that should be pretty simple, but I can struggling to understand: What determines the amount of work done in lifting a ball from one to two metres above the ground? I know that W=Fd and F=ma , so I would assume that the work done would equal m*a*d. Something...

Homework Statement A 7.5 kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling. a) If the box is being lifted at a constant speed of 2.0 m/s, what is the power delivered by the person pulling on the...

Homework Statement A vertical cross section of a tank is shown. Assume the tank is 16 feet long and full of water. (\delta=62.4, and that the water is to be pumped to a height of 8 feet above the top of the tank. Find the work done in emptying the tank. The tank is a triangular prisim with...

Homework Statement A cable weighing 2 pounds per foot of length (and so having a mass of 2 pounds per foot) is suspended from the top of a well 200 feet deep and extends to the bottom. Find the work done in raising the cable to the surface. Over the distance of 200 feet you may use 32m as the...

hi guys am designing a trolley hydraulic jack .. am asked to do a lay out of the arm lifting the wieght .. would you help me how to do good lay out of my lifting pad??

Are their any devices currently available that can assist a human in exerting a force of 700 N or greater? Exactly how much force is 700 N equivalent to? Hydraulics are the only thing that comes to my mind, is their anything lighter? What do exoskeletons use to assist the user to lift greater...

Hi all, when you try to lift explosively a weight there is a acceleration phase and obviously a deceleration phase in order to stop the weight at the end of range of motion(end of repetition). Is it alright to assume that at the deceleration phase less force than the weight is applied?

At present i m working on a hovercraft. Bt the problem is thati can't lift it.. The material i used isthe lightest of all that is thermocoal sheet which weighs approx 145-175gm. So tell me watshould be the motor rpm to lift this junk.. Is there any formula 2 lift this material.. Thnx in advance

Homework Statement The 70kg student in the figure balances a 1200kg elephant on a hydraulic lift. A second 70kg student joins the first student. How high do they lift the elephant? diameter of the piston elephant is on = 2.0m diameter of the piston student is on = 0.48m The liquid inside...

An object of mass 0.550 kg is lifted from the floor to a height of 3.50m at a constant speed. Can someone please check my answers, thanks! 1) How much work is done by the lifting force? (0.550kg)(9.80m/s^2)(3.50)=18.9J 2) How much work is done by the Earth on the object? I was told...

Homework Statement Lifting yourself. A man stands on a platform as shown in the figure below, and pulls up on a rope that winds through a frictionless pulley attached to the platform. The other end of the rope is attached to the ceiling. The mass of the man is m, and the combined mass of...

I'm looking for some input on the design of a lifting device. The design is required to accurately lower lower a load of 400 metric tonnes through a height of 50m, return to the top of it's travel and lower the next load and so on. I'm currently thinking along the lines of a two-pronged tower...

I read that lifting an object higher increases its potential energy. Is this true? I can't see how, considering: Ep = mgh F = mg so Ep = Fh F = (G x m1 x m2)/ d2 so Ep = (G x m1 x m2 x d)/ d2 so Ep = (G x m1 x m2)/ d So the greater the distance between the object and the...

Hello All, I'm currently designing a lifting shackle to aid the recovery of a ROV, my problem is that I'd like to do some hand calculations to find the stresses in the shackle but I'm really not sure as to where to start. I know how to calculate the stresses in the fixing holes but it's...

I'm trying to read Serre's book on Lie algebras and have run into something I can't figure out. Luckily it's on google books so I'll just post a link to the point in question...

Homework Statement A winch is positioned on top of a building, a distance 70 m above ground level. A chain of length 95 m and a mass per unit length of 1.2 kg/m hangs from the winch along the side of the building. Find the work done (in Joules) in reeling up 60 m of the chain.Homework...

Homework Statement A heat engine operating between temperatures of 500 K and 300 K is used to lift a 10-kilogram mass vertically at a constant speed of 4 meters per second. (a) Determine the power that the engine must supply to lift the mass. (b) Determine the maximum possible efficiency...

Homework Statement A 6-kg bucket of water is being pulled straight up by a string at a constant speed. What is the tension in the rope? about 42 N about 60 N about 78 N 0 N because the bucket has no acceleration. Homework Equations \SigmaF=ma ma=T-mg T=ma+mg The...

I'm planning on building a platform for Olympic weightlifting. I'm trying to minimize the weight, so I'd like to be able to properly estimate the sturdiness. The first one is for a piece of wood sitting on beams of some sort. I know that as the beams move father and farther apart, the board can...

so i know that when there is a cable hanging from say a building that is taller than the length of the cable and you want to find the work done lifting half of the cable, you have to split the integral up since each "small piece" of rope in the first half gets lifted up a variable amount while...

If one hangs a spring (of constant 10lbs/ft) vertically and attaches a 10lb. weight to the spring, how much work is done in raising the weight 6 inches from where it hangs naturally? i drew a free body diagram and deduced that when you are lifting the weight up, the forces of gravity and...

Homework Statement Doc Holliday takes his last shot of whiskey. His forearm and hand spans 18" and weighs 2lbs. The shotglass and its intoxicating contents weighs 5ozs. (there are 16 ozs in one pound). Doc remains otherwise motionless as his elbow bends, tossing back the whiskey. Calculate...

I have heard (what I consider to be) a myth of a pole lifting off the ground before it hits. That is, set something like a telephone pole up on end with no initial falling velocity, then let it drop. The claim is that the bottom of the pole actually lifts from the ground before the whole thing...

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...

Not sure about this one, any help? Two men want to carry a wooden beam weighing 200 lbs which is 20 feet long. Both men are equal height however one is stronger than the other and wishes to bear 50% more the weight. How far from the end of the beam should both of the men be to make this possible?

Homework Statement I have to determine the max load a scissor jack must support when lifting a 6000lb car. I know where the center of gravity is acting and the potential locations (distances from the center of gravity) the car will be jacked up. I know the max force is less than 6000 lb...

Ok so I was at the store today and I notised that the hoist they sell seam to be a lot beefyer and stronger lookin them the come a longs ie hand winches and I was wondering why that was dose it take more force to lift 2 ton then it takes to pull the same, I was looking at a 1 ton chain hoist and...

Hi guys! I'm in the VIIth standard, and am building a solar powered RC plane. But however, I'll need help to figure out... One solar panel of a calculator creates 1.53 volts of power under a dim CFL. If photovoltaic cells are influenced by the lumen count, how much can it generate under...

Homework Statement A chain 40 feet in length and weighing 3 pounds per foot is hanging fully extended from a winch. Find the work done by the winch in winding up 30 feet of the chain. Homework Equations Typical segment of the chain: \Delta y_{i} Weight of typical segment of the...

Is it easier to pull up or down to lift a weight on a single pulley systeM? Thanks MB

I'm looking for some advice: I am trying to determine the allowable stress in a lifting attachment we have had manufactured. The lifting attachment is a mild steel block that bolts to the component to be lifted with a lug to enable a shackle to be fitted; two of these blocks are then fitted to...

What is a "lifting function"? Hi, I was reading a journal article and they mentioned something called a "lifting function". It was apparently used with the Navier-Stokes equation to translate the boundary conditions (which were complicated, and NOT non-slip), into a body force. It looks...

Hi all, I'm trying to get my head round how to apply Newtons laws and an exercise like a bench press, probably a bit simple to what you guys are used to. I want to make it as simple as possible to understand what forces would be acting during the eccentric phase of an exercise, I.e lowering...

Homework Statement A 1.65 kg mass is suspended from a string which is pulled upward. The mass accelerates upwards with an acceleration of 3.10 m/s^2. What is the tension in the string?Homework Equations f = ma The Attempt at a Solution seems really easy but i can't get the right answer the...

Homework Statement Right now, I am learning fluids and this question is just asking if i should use either hydraulic or pneumatic fluid for a device that will be able to lift a large fluid.Homework Equations For pneumatic systems, flow rate is most often expressed as standard cubic feet per...

Homework Statement A medical helicopter weighs 7000 lbs. How much upward force must the propeller supply for it to lift off at 10ft/sec(squared)? Homework Equations T-w=ma, w=mg The Attempt at a Solution Here is what I tried: T-w=ma.....w=mg---7000=m(32.2)=217.39k T-7000=...

something i can't grasp is why is it that when you lift one end of a log and the center of mass is raised a certain height you are using less energy than lifting the whole log with the center of mass raised to the same height does it have to do with the amount of mass you're raising?

Homework Statement You are to design a rotating cylindrical axle to lift 800N buckets of cement from the ground to a rooftop 78.0m above the ground. The buckets will be attached to a hook on the free end of a cable that wraps around the rim of the axle; as the axle turns, the buckets will...