Xiaoming, 15 years old, visited an ancient town with his parents and found a "brewing workshop", where he also brewed a local characteristic liquor.

(1) The volume of each stone bar is about: v = 0.5m× 0.2m× 0.1m = 0.01m 3;

∑ρ= mV，

∴ The quality of each stone:

m =ρV = 2.7× 103kg/m3×0.0 1 m3 = 27kg，

Left pressure increase:

△FA = 5G = 5mg = 5×27kg× 10N/kg = 1350n，

As can be seen from the figure, AC=39mm+ 13mm=52cm, BC= 13mm,

DF=45mm+ 15mm=60mm，EF= 15mm，

Tension increase at point b (or point d):

△FD =△FB = ACBC△FA = 52mm 13mm× 1350n = 5400n，

Rootstock pressure increases:

△FE = DFEF×△FD = 60mm 15mm×5400n = 2 1600n；

(2) Increasing the heat transfer area is beneficial to the exothermic liquefaction of gas in the tube;

(3) The density of hot water is less than that of cold water, which will automatically rise to the upper part of the cooling pool with the entry of cold water and be pushed out first, and the water with lower temperature will stay in the cooling pool, which is beneficial to continue to absorb heat; So cold water enters from the lower port B, and hot water flows out from the upper port A,

(4) Because the substances in the distillation pot are mainly water and alcohol, in the distillation process, among the components evaporated from the pot, the proportion of alcohol with lower density is greater than that in the remaining liquid in the pot, and the density of alcohol is less than that of water, so the liquid in the distillation pot has higher density.

Answer: Adding five stone strips at (1)A will increase the pressure on the rootstock by 21600 N;

(2) Increasing the heat transfer area is beneficial to the exothermic liquefaction of gas in the tube;

The answer is the same.