In About 1657 Otto Von Guericke Inventor Of The Air Pump

In about 1657 Otto von Guericke, inventor of the air pump, evacuated a sphere made of two brass hemispheres. Two teams of eight horses each could pull the hemispheres apart only on some trials, and then “with greatest difficulty,” with the resulting sound likened to a cannon firing (Fig. P14.62) (a) Show that the force F required to pull the evacuated hemispheres apart is πR2 (P0─P), where R is the radius of the hemispheres and P is the pressure inside the hemispheres, which is much less than P0. (b) Determine the force if P = 0.100P0 and R = 0.300 m

In about 1657 Otto von Guericke, inventor of the air pump

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