Elevator Definition and 561 Threads

Instead of a space elevator I would like the thoughts on a well. Create a structure from Geo orbit to a altitude where a the atmosphere is thick enough to harvest . Pump the gases to a altitude where it is most practical to processing the gases for shipping. I would like to think of spinning...

I want to know what exactly is the free-electron laser power beaming system that will be used in our future Space elevator and how the conservation of energy and momentum is associated with this project that NASA will launch. ? Other info: I am taking grade 12 university level physics; All...

Let’s imagine that the Space Elevator is built and we ascend to space with its cabin. The cabin stops temporarily at the altitude of 100 km (or a bit more) and then we release some object (sphere, hemisphere) downwards, the question is: what trajectory will it (object) follow when falling down...

Hello! Homework Statement After the cable snaps and the safety system fails, an elevator cab free falls from a height of 36m. During the collision at the bottom of the elevator shaft, a 90 kg passenger is stopped in 0.005 s. Assume that neither the passenger nor the cab rebounds. What are...

Hi Physics Forum! I've been reading about the space elevator and the amazing feat of running a cable past geosynchronous orbit. It occurred to me that there might be an easier way. I may have heard about this somewhere ages ago, or maybe I made it up, but I haven't been able to find any...

Hi, I'm a physics major working an internship for an engineering company at present. I have been trying to model the energy consumption and/or power for an elevator system. The goal is to be able to input different variables (cab weight, capacity, counterweight percentages, motor types...

I am a third year chemical engineering student and don't have much experience in the mechanical stream so I was hoping someone here could help me. At the moment I have an apparatus that consists of a sheet of metal with four syringes sticking through (metal sheet is horizontal, syringes are...

A box sits on the floor of an elevator, which is falling freely downward. Which one of the following statements is true? a. The acceleration of the box is zero. b. THe weight on the box is zero. c. The normal force of the box is zero. For this question, I'm debating between a and c. The...

I need to find the forces in the axial members, loading on the lifting eyes and pulley shaft. Attached is a photo of the pulley system. I have no idea where to start so any help would be muchly appreciated.

Hi I read in a paper that the enrgy saving in taking a payload to geostaionary orbit with a space elevator is (R/Rg)*(2-R/Rg) where R- radius of earth, Rg - radious of geostaionary orbit. How is this obtained ? TIA

Hi I read in a paper that the enrgy saving in taking a payload to geostaionary orbit with a space elevator is (R/Rg)*(2-R/Rg) where R- radius of earth, Rg - radious of geostaionary orbit. How is this obtained ? TIA

This, in my opinion, is a no-brainer. But i decided to post this as a confirmatory proof to a friend who refuses to see reason! The argument: In an elevator whose cable has snapped, irrelevant of whether it's stationary or going up/down, the person inside will travel upwards in the falling...

1. An elevator is moving upward with constant velocity V. We consider a frame of reference fixed to the elevator. Since it is not accelerating, our system is equivalent to, say, a frame of reference fixed to the ground (there are no inertial forces). Now, we are inside the elevator and let an...

1. An elevator cab in the New York Marriott Marquis has a mass of 4.15 x 103 kg and can carry a maximum load of 1.80 x 103 kg. If the cab is moving upward at full load at 3.57 m/s, what power is required of the force moving the cab to maintain that in kilowatts?W=Work P=Power t=Time F=Force...

When the elevator approaches the top of a building and slows to a stop, what direction is the elevator's velocity & acceleration?

Hi, I'm a bit confused: Picture an elevator accelerating upwards with a person standing inside on top of a balance. Since the elevator is accelerating upwards, the Normal reaction force from the ground must be greater than the weight of the person. My question is: Why doesn't the scale...

So many telecom operators claim that their users will get network coverage even inside an elevator. But according to Gauss' theorem, no charge is supposed to exist inside a closed conductor and an elevator (made of metal) is a closed conductor... So how is one supposed to get network coverage...

So I had this problem regarding an elevator with a man inside. In the first part of the question we had to calculate the tension in the cable, which I managed to do alright. The Second Part however, I am having difficulty and it asks for the following: When the lift is decelerating by 1...

A courier is delivering a 5kg package to an office high in a tall building. a) What upwards force does the courier apply to the package when carrying it horizontally at a constant velocity of 2m/s into the building? B) The Courier uses the elevator to reach the office. While the elevator...

Barometer reading in an elevator... Homework Statement A barometer kept in an elevator reads 76cm when it is at rest. If the elevator goes up with increasing speed , the reading will (a).increase (b)decrease (c)remain constant (d) become zero... Homework Equations The Attempt at...

Homework Statement Near the surface of the Earth, a block of cheese with mass m lies on the foor of a elevator cab with mass M = 1,000m (i.e., the mass of the cab is 1,000 times the mass of the cheese) that is being pulled upward by a cable. If through the distance d = 2m, the normal...

Homework Statement The figures depict situations where a person is standing on a scale in eight identical elevators. Each person weighs 600 N when the elevators are stationary. Each elevator now moves (accelerates) according to the specified arrow that is drawn next to it. In all cases where...

Question: You've always wondered about the acceleration of the elevators in the 101-story-tall Empire State Building. One day, while visiting New York, you take your bathroom scale into the elevator and stand on it. The scale reads 150 lbs as the door closes. The reading varies between 120 lbs...

Homework Statement Vi=0 m/s, D=1m, Time=1.6s, m=9.2kg, g=-9.8 m/s squared Homework Equations T=F=ma, The Attempt at a Solution I thought that it would be as simple as finding the net acceleration in the system, and then multiplying it by the mass. Unforunatlly I can not come up...

Homework Statement A 75kg man stands in an elevator. What will be the force the elevator exerts on him when: a) the elevator is at rest b) the elevator is moving upward with a uniform acceleration of 2.0m/s^2 c) the elevator is moving downward with a uniform acceleration of 2.0m/s^2.Homework...

Homework Statement An elevator ascends with a constant speed of 2.5m/s. A loose bolt drops from the ceiling of the elevator which is 3.0m above the floor. a) How long does it take the bolt to fall from the ceiling to the floor of the elevator? b) What are the displacements of the bolt...

Homework Statement An elevator accelerates constantly upward from rest and passes the second floor, 5.00 m above the first floor, 1.65 s after it passes the first floor. What force does the floor of the elevator exert on a 48.0 kg passenger? Assume the elevator starts from rest at the ground...

Greetings, I am writing a Fan Fiction for someone and had a technical question. I like to do as much research as possible and have my "work" be as accurate/realistic as possible, so here I am. I know this might not be the place to ask it, but if you know of any place more suitable I wouldn't...

Homework Statement Elevator weighs 1400 kg with an initial velocity of 12 m/s (moving downward). With a constant acceleration, the elevator comes to a stop in 41 m. What is the tension on the elevator cable? Homework Equations T=m(a+g) The Attempt at a Solution I'm having trouble...

Homework Statement An elevator is lifted by a capble with a tension fo 50,000N. The weight of the elevator is 49,000N. How fast will the elevator be moving after 5 seconds if it starts from rest. Homework Equations IDK! The Attempt at a Solution I found the net force to be 1000N...

Homework Statement I am tasked to summarise this paper http://chaos.swarthmore.edu/courses/PDG07/AJP/AJP000125.pdf I am struggeling to understand the statements of tension at the bottom of the first side namely For an element at geostationary height
that is, at a distance from the...

Homework Statement What is the net force of a 60 kg person, in Newtons, in an elevator accelerating at 5 m/s/s; a) upwards? b) downwards? Homework Equations F = ma The Attempt at a Solution a) F = 60 (5+9.8) F = 60 * 14.8 F = 888 N [up] b) F = 60 (-5+9.8) F = 60 * 4.8 F...

[SIZE="3"][FONT="Georgia"]This is part of the space elevator problem. It starts with a swinging rod scenario: 1. Suppose that you swung a rod of mass m and length l at angular speed w in a vertical circle with your shoulder as the axis. The distance ra is the length of your arm, which is the...

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 836 N. (a) As the elevator moves up, the scale reading increases to 936 N, then decreases back to 836 N. Find the acceleration of the elevator (ms^-2). (b) As the elevator approaches...

Homework Statement The motor for an elevator can produce 14kW of power. The elevator has a mass of 1100 kg, including its contents. At what constant speed will the elevator rise? Homework Equations I'm not really sure. Probably Gravitational potential = mgh. Kinetic energy = 1/2mv^2...

Homework Statement This program simulates the actions of two elevators in a building. The building has MAXFLOOR floors - make this a program constant and set it to 15. You need to write an Elevator class. This class will have only one member variable, which is the floor of the building on...

Suppose the classic elevator is created, affixed to the Earth somewhere on the equator. The elevator would be perfectly balanced so that there would be no net force i.e. the centrifugal force of the string and end station would equal the force of gravity. What would happen if the cord was...

If you were to way an object on a Newton spring scale in an elevator, when would the scale display the largest number? elevator moving up moving down no affect In my opinion, an acceleration in the elevator would be required, as that would unbalance the forces and was traveling at a...

let's say I'm in einstein's elevator or let's say I'm in a box with no measuring possibilities, no sensors to help me a box that's in a spaceship that's traveling with an acceleration of 9.8m/s^2 would i feel the same way as if i were on earth, on the ground, in a box? or, between inertial...

Homework Statement A 60.0 kg woman on a scale is in an elevator. The combined mass of the elevator and the woman is 815 kg. The elevator accelerated upwards, and during the acceleration, the hoisting cable applies a force of 9410 N. What does the scale read during the acceleration...

Homework Statement Your mass is 65 kg. You stand on a bathroom scale in an elevator on Earth. (a) What force would the scale exert when the elevator moves up at a constant speed? (b) What force would the scale exert when it slows at 2.1 m/s2 while moving upward? (c) What...

A woman stands on a scale in a moving elevator. Her mass is 60.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9410 N. What does the scale read...

Homework Statement A 72.0 kg man is standing on a spring scale in an elevator at rest. The elevator ascends, attaining it's max velocity of 1.20 m/s in .800s. It travels with this constant velocity for 5.00s. The elevator then undergoes a uniform acceleration in the negative y direction for...

Homework Statement There's a 75 kg passenger in an elevator a. what is the passenger's apparent weight when acceleration is zero? b. what is the passengers apparent weight when acceleration is positive? c. what is the passengers apparent weight when acceleration is negative? Homework...

While riding on an elevator descending with a constant speed of 3.2 , you accidentally drop a book from under your arm.How long does it take for the book to reach the elevator floor, 1.0 below your arm?

This relates to the thread "https://www.physicsforums.com/showthread.php?t=431712"" started by Passionflower, but is hopefully even simpler (but non trivial). The basic question, is what is the length of a falling elevator (or ruler) that is reasonably rigid, according to: 1) A...

When horizontal light "bends" in an accelerating elevator is it following the geodesic line of a space curved by a gravitational equivalent or is it deflected, picking up a vertical component at the expense of the horizontal, though still going c.

Suppose I am standing in an elevator which is moving downwards with an acceleration exactly equal to the acceleration due to gravity. This means that I'm in a complete state of weightlessness. If I try to jump in the elevator (with feet on floor), will I be able to do so?

Homework Statement In the figure, a 25 kg block is pulled by a 100 N force and slides across the floor of the elevator. The coefficient of friction is µ = 0.35. If the elevator is accelerating downward at 2.0 m/s2, what is the resulting acceleration of the block? See Figure 1 Homework...

Homework Statement A 5.0kg salmon is weighed by hanging it from a fish scale attached to the ceiling of an elevator. What is the apparent weight of the salmon if the elevator is (a) at rest, (b) moving upward at 2.5 m/s2, and (c) moving downward at 3.2 m/s2? Homework Equations Sum of F...