-
Anonymous users2024-02-07The Burj Khalifa elevator is only 10m s... And only to the 124th floor...
The acceleration due to gravity is, so the descent cannot exceed meters.
The world's fastest elevator is actually KONE, but the developer of Taipei 101 has Japanese shares, so as long as Japanese goods, KONE sold its traction machine, door operator, and control cabinet to Toshiba, and Toshiba sold it to 101... The elevator upward speed of 101 is.
-
Anonymous users2024-02-06I remember that it was 9 meters per second. In fact, this speed is the speed at which the elevator runs from the lowest floor to the highest floor, and it does not stop in the middle, and it will slow down in advance when it is about to reach the corresponding floor. You won't feel anything inside, and it's impossible to reach the speed of free fall.
-
Anonymous users2024-02-05It's not possible, if you exceed the speed of free fall, wouldn't you have to rush down with the head on the top of the car? ?
There should be a limit to the downward speed, but if the elevator goes up, Toshiba also has an elevator with a speed of 16m s.
-
Anonymous users2024-02-04It is common sense that we must first make it clear that the acceleration and velocity of an object are two different concepts.
If its velocity exceeds, the degree of acceleration may not exceed the acceleration of gravity; On the contrary, if the velocity is not exceeded, the acceleration may not be exceeded.
According to the principle of the current elevator run dragged by a one-sided wire rope, we can conclude that: theoretically, the downward speed of the car can be exceeded, but its acceleration will not be exceeded.
Acceleration of a body in free fall.
From this, we can conclude that when running downwards at the same height, it will always take more time for a single-sided wire rope to drag the elevator car than it does for a free-fall.
In the news "Take the elevator from the highest point of the tower to the bottom of the tower." shorter than the time it takes for a stone to fall from the highest point to the bottom of the tower" is false.
-
Anonymous users2024-02-03Otis designs elevators for the Burj Khalifa, the world's tallest building.
**: Chongqing** 2009-10-23 News (Reporter Guo Xiaojing) Yesterday, Otis global president Mai Shaode said in Chongqing that Otis is currently designing a through elevator for the world's tallest building, ——— Burj Khalifa.
At over 600 meters tall, the Burj Khalifa is the tallest tower in the world. One of the elevators provided by Otis is from the ground floor to the top floor, and it is not possible to change the elevator in the middle, and we are designing this elevator. McShaode said that no company in the world has ever made such an elevator.
Otis accepted the challenge and decided to invest in a co-construction with the Burj Khalifa owners.
-
Anonymous users2024-02-02According to reports, the Burj Khalifa will have more than 160 floors and 56 elevators with a speed of 18 meters per second, which will be the fastest and longest elevator in the world. "This design will be the pinnacle of what technology can achieve, and no building has ever been built as high as before. New elevators have had to be developed that can accommodate this height.
Naman Attala, sales manager at Elma Properties, said.
-
Anonymous users2024-02-01Summary. Ultra-high-speed elevators often have large acceleration and deceleration, which will cause greater overweight and weightlessness to passengers. When the elevator runs too fast, there will be large vibration and noise, the air pressure in the car will change sharply, and some passengers' eardrums will feel uncomfortable.
So high-speed elevators are not yet common Ordinary people can't withstand such gravity Like Dubai's high-speed elevators, there is only one, and the others are layered upstairs There is a transfer area on the middle floor of the Burj Khalifa, which seems to be a 74-floor transfer So if you separate it like this, the elevator speed will not reach the super high speed, and the one you said will go straight to the 124th floor in 1 minute, and there is only one Ordinary people will not be full to sit on that.
Ultra-high-speed elevators often have large acceleration and deceleration, which will cause greater overweight and weightlessness to passengers. When the elevator runs too fast, there will be large vibration and noise, the air pressure in the car will change sharply, and some passengers' eardrums will feel uncomfortable. So the high-speed elevator is not yet common to prepare for hail digging Ordinary people can't withstand such gravity Like Dubai's high-speed elevator, there is only one, and the others are layered imitation core upstairs There is a transfer area on the middle floor of the Burj Khalifa, which seems to be a 74th floor transfer So if you separate it like this, the elevator speed will not reach the super high speed, and the one you said will go straight to the 124th floor in 1 minute, and there is only one Ordinary people will not be full to sit on that.
You've done a great job! Can you elaborate on that?
Ultra-high-speed elevators often have large acceleration and deceleration, which will cause greater overweight and weightlessness to passengers. When the elevator runs too fast, there will be large vibration and noise, the air pressure in the car will change sharply, and some passengers' eardrums will feel uncomfortable. So the high-speed elevator is not yet common to prepare for hail digging Ordinary people can't withstand such gravity Like Dubai's high-speed elevator, there is only one, and the others are layered imitation core upstairs There is a transfer area on the middle floor of the Burj Khalifa, which seems to be a 74th floor transfer So if you separate it like this, the elevator speed will not reach the super high speed, and the one you said will go straight to the 124th floor in 1 minute, and there is only one Ordinary people will not be full to sit on that.
-
Anonymous users2024-01-31B test question analysis: the elevator descends in the process of acceleration first, then at a constant speed, and finally decelerates to zero, when in the constant speed stage, the tensile force is equal to gravity, a is wrong; When the elevator runs down from the 160th floor, the initial and final velocities are zero. According to the kinetic energy theorem, the work done by the combined external force is equal to zero, then the magnitude of the work done by the tensile force is equal to the magnitude of the work done by gravity, b is correct.
For option C, this option is incorrect if the elevator accelerates to maximum speed first and then decelerates immediately, but if the elevator accelerates first and then at a constant speed and then decelerates at the end, this option is correct (regardless of the moment when acceleration is obtained) C is incorrect. It is impossible for the elevator to do constant power work, because the power is equal to the product of the tensile force and the velocity, the initial and final state of the elevator, the power is zero, and d is wrong.
An object that falls without any resistance and only under the action of gravity is called "free fall". Such as an object that begins to fall from a resting state under the gravitational pull of the earth. The sky above the Earth's surface can be seen as a constant gravitational field. >>>More
The paradox of free fall is Galileo's thinking that the idea of free fall is mainly used to overturn Aristotle's idea that the heavier the heavier, the faster the fall, specifically like this, if the heavier the object falls, then now choose two objects, one heavy and one clear, when they fall from a high place, of course, the heavy one falls fast, and the light one falls slowly, if these two objects are tied together, and the weight of the rope is ignored, then the two objects tied together fall from a high place, whether the object with specific gravity is faster, or the object with specific gravity is slow, because two objects tied together to form a whole, must be heavier than the heavier object, so he should fall faster than the heavier object, but consider the two objects tied together separately, the light object is slow, the heavy object is fast, and the light object will definitely pull the heavy object is their overall velocity is less than that of the heavy object, so that two opposite conclusions are drawn from the same event, thus negating Aristotle's theory, which is Galileo's free fall paradox.
It should be the wrong answer.
It takes seconds for a ball to fall from a height of 100 meters (that is, 20 under the root number), and if you divide it, you can throw 8 more balls in 4 seconds, so there are 9 balls in the air. >>>More
First, the nature is different.
1. Free fall. >>>More
The fall of a 1000kg elephant is indeed a free fall, falling from a place of 125m, from the free fall formula 1 2gt 2=h to calculate the time is exactly 5s, the ants fall from the same place It takes a long time because the resistance of the air is taken into account, the meaning of the question is that the elephant should ignore the air resistance, so the time should also be 5s, otherwise this problem is not easy to do (the question does not give a functional relationship between air resistance and velocity).