答案:
(1)水对茶壶底不的压力
$ 1.0 \times 10^3 \mathrm{~kg} / \mathrm{m}^3 \times 10 \mathrm{N} / \mathrm{kg} \times 12 \times 10^{-2} \mathrm{~m} \times 4 \times 10^{-3} \mathrm{~m}^2=4.8 \mathrm{~N} $
(2)茶壶对桌面压强 $ p = \frac{(0.6 \mathrm{~kg}+0.4 \mathrm{~kg}) \times 10 \mathrm{~N} / \mathrm{kg}}{4 \times 10^{-3} \mathrm{~m}^2}=2.5 \times 10^3 \mathrm{~Pa} $