A vertical cylindrical tank has a diameter of 1m and a height of 2.50m. The tank, open at the top and is 3/5 full, is rotated about its vertical axis at a constant angular speed. At what angular velocity must the tank be rotated so that the diameter of the exposed surface at the bottom of the tank is 40cm? choices: 145.94, 149.00, 129.03, 135.19

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Control Survey and Geodetic reductions

Control surveys or survey controls are used to establish reference points as a basis for various construction activities. Vertical and horizontal control points are to be established in a control survey to increase accuracy. After establishing the control points, all other types of surveys such as topographic, right-of-way, aerial mapping, construction layout, boundary surveys, and utility mapping can be worked upon so that control networks can be formed. The place from which the observations are made is called a survey station.