April 2018

How to Balance a Closed Traverse – Use of Compass Rule (Bowditch Method) – Solved Example

Hi, Download the image below to read them properly. The solution is handwritten on a page and then clicked. It shows the angular closure, correction, azimuth, bearings, latitude and departure and corrected distance calculations. Problem:Following is the Field Data for a 4 sided, closed traverse, and you have to find the azimuth, bearings and corrected distances […]

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Complete Derivation of Mass Moment of Inertia of Hemisphere(Half Sphere) about the Symmetric Axis of Rotation.

The top half of the sphere is created by rotating the circle of x2+y2=r2 around the y-axis. If the rigid body has mass m and density (rho), find the mass moment of inertia about y-axis in terms of m and rho.  Solution First, consider a small slice of the hemisphere of thickness ‘dy’, and write

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How to Plot graph with Multiple Data Sets in Microsoft Excel (scatter function)

Hi, If you have more than one data sets to be plotted on the graph, you can easily do that in excel under the ‘insert’  scatter option. Follow the given eight steps with images.  Step.1 Make three data sets separately, and choose ‘scatter’ graph under ‘insert’ menu. Step.2 Right click on the scatter graph, and select ‘select

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Use Method of Section on Gambrel Truss and Find section Forces – Solved Example

Hi,Problem:This is a Gambrel Truss with 5 known load forces on it as shown below. Let’s say the reaction forces are already found, at A(0, 959.6 N) and at H(0, 450 N). Each applied load is 300 N.Use the method of sections to determine all the unknown external forces acting on section ABG. Using your

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High Point of a Vertical Crest Curve – Solved Example

Hi,Problem:A 1200 ft crest vertical curve is defined by grades of +2.0 percent and -4.0 percent, respectively. If the elevation and station of the PVC is 200 ft and 202 + 30 respectively. determine the elevation and station of the highest point on the curve.Solution:Thank you for your kind visit. If you have any doubt,

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Increase in flow when Two parallel Identical Rectangular channels are combined to form Single with same Depth

Hi,Problem: Two parallel identical rectangular channels have a base width B= 3ft and are flowing with a depth D= 2ft. Calculate the percentage increase in flow rate if the channels were combined into a single rectangular channel of bse width 2*B = 6 ft and the same channel depth.  Solution: If the example was helpful

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Moment of Three Vector forces about a Point O and its Resultant (solved example)

Hi, Problem:  Determine the resultant moment about the fixed end at joint O. F1 = (-60i + 40j +20k) lbs F2 = (80i + 40j -30k) lbs F3 = (40i + 20j – 15k) lbs A) Show all steps using Cartesian Vector Notation. B) Show all steps using Scalar Notation. C) Show the final orientation

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Extension of Tapered Bar (Cone Frustum) due to its Self weight and applied Load (Solved Example)

Hi,Problem: A uniformly tapered bar of steel 500m long is suspended vertically and supports a land of 1KN attached to the lower end. The bar has a circular cross-section with a diameter of 10 mm at the lower end and 20 mm at the upper end.Find the total extension of the bar due to its own weight

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