$2\mathrm{.}10\mathrm{.}3$ Consider the curved surface shown in Fig. P$2\mathrm{.}10\mathrm{.}3$a and b$.$ The two curved surfaces are identical. How are the vertical forces on the two surfaces alike? How are they different?

$($a$)$

$($b$)$

FIGURE P$2\mathrm{.}10\mathrm{.}3$