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Grade: upto college level
        
In 16S4 Otto von Guericke, Burgermeister of Magdeburg and inventor of the air pump, gave a demonstration before the Imperial Diet in which two teams of horses could not pull apart two evacuated brass hemispheres. (a) Show that the force F required to pull apart the hemispheres is F = πR2∆p, where R is the (outside) radius of the hemispheres and ∆p is the difference in pressure outside and inside the sphere (Fig. I5-21). (b) Taking R equal to 0.30S m and the inside pressure as 0.100 atm, what force would the team of horses have had to exert to pull apart the hemispheres? (c) Why were two teams of horses used? Would not one team prove the point just as well?
3 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
471 Points
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(c) The two teams of horses were used so as to pull apart the brass hemispheres. They could not do so as the pressure difference is too high. For such pressure difference, large amount of force is required.
3 years ago
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  • Discussion Forum
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