Lifting Definition and 247 Threads

Why don't we just skip the formalities and compare penis sizes right now? Sure, but that just means they pushed themselves too hard. Congrats! You now cannot work that part of your body for a significant amount of time. How strong will that make you? Holy crap you're right! I'll go...

Homework Statement The Simpsons are sitting on their 2 meter-long family sofa. They are being evicted but refuse to leave their sofa. The police send two movers to lift the couch. Each grabs one end.< /sub> M Homer = 100 kg M Santa's Little Helper =20kg, MMarge= 60 kg, MLisa=30kg...

We are making a Mechanical Car Lifting Jack as part of our Manufacturing Process course. A few questions :- 1. It looked too simple to me, but sometimes it doesn't. Like it has quite a nice assembly. Where do you put it on difficulty scale ? 2. What do you suggest that we do calculations...

Is the concept the same? If I am able to bench press a maximum of 200lbs, and I were to push with full force a scale bolted in a stationary position at the weakest point of my bench press motion, would the scale read 200lbs?

Homework Statement "A derrick boom is guyed by cables AC and AD. A worker is lifting a 20kg block by pulling on a rope that passes through the pulley at A. Knowing that the boom AB exerts a force A that is directed from B to A, determine this force and the force in each of the two cables."...

Hi guys, how would one measure the lifting force that an electric out runner motor could put out. assuming one knows the rated power of the motor, how does one convert this into lifting force? Thanks, Ben.

hi! I have a question regarding work done lifting an object vertically upwards, under water. I am aware that work is done against hydrostatic pressure (which varies depending on a depth h from the surface), and that density of the fluid and the object may have a role in the calculation of...

My opinion is that it won't change much. I feel that the Bush administration and the oil companies are just pulling a fast one on us because Bush wants to lift these bans before he leaves office. The public are eating it all up. There are two main arguments that they use to advocate...

Question: A mother leans horizontally over the crib to lift her 16.7 kg baby. The moment arm of the baby about the hip joint is b = 0.53 m. Her upper body has a mass of 58.0 kg and a moment arm of t = 0.450 m. The back muscles are equivalent to a single muscle with an angle theta = 11.5° to the...

Hi, Question: Is the Lifting Power of Air in Water solely based on its Volume or does the pressure of the Air factor in? As an example, in Salt water if you have a Bell with 2 Cubic ft of Air in it, at the Oceans Surface it can lift 128 Lbs, because air can lift the amount of Water it...

I want know that lifting magnets for lifting a lots of cars ; so it use energy or not? Why a lifting magnet use energy? It can only have a static force with his superconductor ! Why that superconductor use energy(electricity) for his static force? virtualempire.com/banners/vebtn3.gif

If you have to lift some large mass a certain number of feet is there a way to calculate the amount of brain power used?

I am having a small misunderstanding regarding the concept of work, and I am hoping someone could clear things up for me. I am reading Principles of Physics by Serway and Jewett, and it has an example of a person lifting a box vertically. It states that the work done by the person lifting...

Lift anyone! Hii Everybody, I am involved in a project and I need some guidance for my design. Design Purpose: I am trying to create/find a mechanism that will provide me with up-down motion. For example think of a match-box type rectangular box that needs to be moved up-down in...

Yes, I know it is not anti gravity, but what mechanism do you think causes it. Could someone theoretically show me how an asymmetric capacitor can overpower its mass even with something like 60 keV between the conductors. I just don't see how a capacitor lifts off the ground no matter what...

I have this crazy idea to make an air hockey table out of some junk laying around the basement. Before I waste my time messing around with an old table and vacuum I figured I would brush up on my basic physics to figure some stuff out. Lets say we want to lift up a lightweight hockey puck...

ok, I am not a physics student, engineer, or mathematician, but i have an idea i need to know will work or not. we've all undoubtedly seen star wars ep 1 with the podracer race...floating engines. would an alternator connected to a turbojet produce enough voltage to power an ion lifter? are...

Homework Statement You slowly lift a box of books from the floor and put it on a table. Earth's gravity exerts a force, magnitude mg, downward, and you exert a force, magnitude mg, upward. the two forces have equal magnitudes and opposite directions. It appears that no work is done, but you...

Homework Statement A sand mover at a quarry lifts 2,000kg of sand per minute a vertical distance of 12 meters. The sand is initially at rest and is discharged at the top of a sand mover with speed 5m/s into a loading chute. At what minimum rate must power be supplied to this machine? A) 524w B)...

Homework Statement A freight elevator weighing 3000 pounds is supported by a 12 foot long cable that weighs 14 pounds per linear foot. Approximate the work required to lift the elevator 9 feet by winding the cable onto a winchHomework Equations W = int(f)dyThe Attempt at a Solution The work...

How much work is done lifting a 25-ft chain over the side of a building? Assume that the chain has a density of 4 lb/ft. Hint: Break up the chain into N segments, estimate the work performed on a segment, and compute the limit as N approaches infinity as an integral. (The small segment of...

Abstract Algebra -- lifting up a factor group After spending an extended period with my Professor during office hours I must admit I am mystified. He kept on talking about "lifting up" factor groups. I think this has something to do with using a factor group, say G/N, to show that there...

I was reading about some recent announcements by Aeros and their competitor SkyCat, both of whom are seeking to marke large hybrid airships as a means of transporting very heavy payloads through the air. I'd like to ask, what would be the best engineering solution to safely transport the...

hi, i am in the final yr aerospace engg...i am trying to write a program on MATLAB to calculate the lift distribution over a wing using the numerical estimation based on the classic(prandtl) lifting line theory...however, due to my relatively limited exposure to MATLAB i am having trouble...

Homework Statement A force is exerted by a rope lifting a 2.0kg mass a vertical distance of 10m from the ground. A graphs shows F (N) vs d (m). THe F starts at 20 N and goes to 30 N in a straight line as d goes from 0 to 10m. What is the final speed of the box at 10m? Homework Equations...

I post this question here as a starting point, because I am not sure which forum this question would best be answered in. If this isn't the best place for this question, please let me know. I have been puzzling over the lifting of water using heat, and see a few different methods that it can...

Homework Statement A seagoing crane lifts a sealed safe from a sunken ship. The average density of the safe is 5.3 grams/cc and its mass is 120 kg. What is the tension in the lifting cable when the safe is still submerged? Homework Equations Pressure = density *gravity* height*...

Hi everyone Please note: It is not a homework-type question. I haven't got springs in my course. Suppose we have a rod, a spring and a heavy object of weight 50 N. If we lift the object with the help of a rod upto 1m, work done by us is 50*1=50 J. Now we remove the rod and lift the same...

If I have two rubber coated kevlar balls, one is filled with air and the other has a gas like helium in it, if submerged underwater, would the ball with helium be harder to keep underwater than the air filled ball would be, or would they be equal in their buoyancy? Also is helium easier to...

Hi, I am creating a mechanism that needs to be able to lift a plank of wood up and down arpund a pivot. However, there isn't enough space below the wood to enable me to place a cam. So i thought I might be able to place a cam above the wood - although this would mean the follower would have no...

Equal work lifting versus pushing up a plane?? I don't understand anything in physics having to do with work and/or energy. I drew a picture of the problem I'm having now: http://img80.imageshack.us/img80/9834/physicsoc8.png According to every physics book/website ever, the work in...

Homework Statement An athlete whose mass m is performing weight lifting excersies. Starting from rest positions, he lifts, with constant acceleration, a barbell that weighs w. He lifts the barbell a distance of x in time of t. Use Newton's laws to find the total force his feet exert on the...

Hello, This is my first question, I've been pondering for awhile now. Example: I have a beam, it is 21' in length and weighs 397.5 lbs total. I am about to lift one end of this beam. I would like to know how to figure the weight I am lifting on this one end. Assume the weight is...

In the figure, a cord runs around two massless, frictionless pulleys; a canister with mass m = 25 kg hangs from one pulley; and you exert a force F on the free end of the cord. What must be the magnitude of F if you are to lift the canister at a constant speed? Here i know that the answer is...

If you ever rode a bike, you might notice that trying to lift yourself up (while sitting on the saddle and riding) when traveling at high speeds is more difficult than when you are traveling at low speeds. Why is this? I think that the reason is more to do with the fact that when you lift...

take a balloon filled with helium if you where to make the balloon rigid, without changing its weight, then suck half of the helium out of it. would the balloon, with the same volume but different density, have more lifting power?

This seem to be a contraversial issue but does lifting weights during the early teenage years or just before puberty like 14, stunt growth? I am talking about often but normal weight training like 1 hour sessions for 5-6 times a week and with relatively normal weights although on the heavy...

I have heard of a lifting reentry that is used for lessening the deceleration on reentry. Can anyone explain how this works?:confused:

In which of the following would a person do the least amount of work? A. Lifting a 10 kg box a vertical height of 1.2 m. B. Lifting a 10 kg box a vertical height of 1.2 m using a ramp. C. Pushing a 10 kg box along a smooth floor a distance of 1.2 m. D. Dragging a 10 kg box along a rough...

A 2000kg elevator rises from rest in the basemtn to the fourth floor, a distance of 25m. As it passes the fourth floor, its speed is 3.0 m/s. There is a constant frictional force of 500N. Calculate the work done by the lifting mechanism. I tried doing v2square = v1square + 2ad and i get 0.18...

the incredible lifting machine heat loss?? While stumbling upon this website on the Incredible lifting machine, http://tigre.ucr.edu/dipen/phy11/heat.htm I was wondering what could be some of the reasons why the work down calculated as in mgh does not equal to the work done under the pv...

How much work is done by a person lifting a 2.0kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0s? I know w=fd. I found the distance to be 10m. But what is the force? F=ma so what is the acceleration of the system?

Can someone help me. The questions are in bold and my anwsers are not. Can someone explain it to me. 1. Why do you feel hot after lifting weight? Does it have something to do with cellular respiration.. 2. Can you tell when your muscles went into anaerobic respiration? What evidence...

Lets say you have a very long (and strong) tube (310m high) filled with water. at the bottom, the tube comes back up, forming a U shape. if the radius at the end of this U shape was 0.1m.. does this mean that (absolutely regardless of the radius of the top at the top, and therefore the...

Sometimes when I am lifting weights (biceps exercise) I get a "zing" in my elbow, usually my left, and usually when I'm tired or otherwise trying to lift more than is comfortable. It feels like the nerve is being pinched. What might cause this, and how much attention do I need to pay to this?

Hey, I was wondering if sit ups/curl ups and weight lifting stunt growth. Due to the amount of weight and muscle not allowing bones to grow any further. If so, does sitting down while lifting weights help?

A 2.80*10^2 kg piano is being lifted at a steady speed from ground level straight up to an apartment 12.0 m above the ground. The crane that is doing the lifting produces a steady power of 4.00*10^2 W. How much time does it take to lift the piano? i know that i have to use the equation Time=...