The tube shown is filled with mercury. Calculate the force applied to the piston. The piston is circular with a diameter of D. Consider the Pmercury = 13550 kg/m³ and g=9.81 m/s². Assuming D-60 mm, d=20 mm, H=250 mm and h=30 mm. F= N F H

3) The following table contains a set of measured levels for an open traverse Station CP1 (BM) 1a 1b CP2 2a 26 CP3 BS IS FS 1.430 3.370 2.010 1.010 2.980 1.410 0.400 0.670 RL 277.650 Find the RL values and do a checking i) use RISE and Fall Method ii) use Method of Height of Plane of Collimation<

3.8 sq ft=​___ sq in.

SITUATION 3. a) The base and altitude of a triangle lot were measured to have certain probable errors of 314.60 0.16 and 92.60 = 0.14, compute the probable error of the resulting computation. (3- b) The following sides of a rectangle and its probable errors are 120.40 0.04 and 360.50 ± 0.08 respectively. Compute the probable errors of the sum of the sides (perimeter) of rectangle. (3r c) The probable error of the mean of 6 observation is 0.043 and the most probable value of the measurement is 860 m compute the relative precision. C