You repeat von Guericke’s experiment (see Figure 12-7) using somewhat smaller half spher...

You repeat von Guericke’s experiment (see Figure 12-7) using somewhat smaller half spheres and find that two teams of eight horses are just strong enough to pull the half spheres apart. You then transport the apparatus to Denver, which is at an elevation of 1 mile. Will you need more or fewer horses to pull the half spheres apart? Why?