Cuantas horas hay en un microsiglo? Exprese su resultado con dos cifras significativas... el resultado me dio 28.050601, si son dos cifras significativas se escribe como 28 o como 28.000000 ?

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg