Why do tall tree collaspe in stroms​

May someone explain how to do this question?

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

Amanometer is used to measure the air pressure in a tank. the fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 34 in. if the local atmospheric pressure is 12.7 psia, determine the absolute pressure in the tank for the cases of the