In about 1657 Otto von Guericke, inventor of the air pump, evacuated a sphere made of two

Question:

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 €œwith 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