- #1
Roger900
- 11
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Hello Specialists in Physics!
Way back in 1657, von Guericke in Madeburg Germany demonstrated the tremendous force of atmospheric pressure by placing two large hemispheres together, evacuating the air from inside, and hitching a team of horses to each hemisphere. The horses were unable to pull the hemispheres apart. In fact, it took four teams straining on each side to break the vacuum seal.
What if von Guericke's experiment was performed today, but instead the set-up was a horizontally mounted cylinder with 2 pistons in the cylinder. Assume the pistons have pneumatic seals that provide zero vacuum leakage, but the seals do have a maximum PSI point before failure. Assume the pistons are separated 1” apart, and in this 1” cavity a 95% vacuum was drawn, and then the cavity is sealed. How much force would be required to “pull” the pistons further apart? Can they even be pulled apart? At what force would the pneumatic seals fail?
Thanks,
Roger
Way back in 1657, von Guericke in Madeburg Germany demonstrated the tremendous force of atmospheric pressure by placing two large hemispheres together, evacuating the air from inside, and hitching a team of horses to each hemisphere. The horses were unable to pull the hemispheres apart. In fact, it took four teams straining on each side to break the vacuum seal.
What if von Guericke's experiment was performed today, but instead the set-up was a horizontally mounted cylinder with 2 pistons in the cylinder. Assume the pistons have pneumatic seals that provide zero vacuum leakage, but the seals do have a maximum PSI point before failure. Assume the pistons are separated 1” apart, and in this 1” cavity a 95% vacuum was drawn, and then the cavity is sealed. How much force would be required to “pull” the pistons further apart? Can they even be pulled apart? At what force would the pneumatic seals fail?
Thanks,
Roger