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March 29, 2015

Homework Help: Math ( Surveying )

Posted by Dale on Monday, September 20, 2010 at 4:09pm.

Need help with this problem! Thanks in advance.

The ground clearance of an overhead electrical cable must be determined. Surveyor B is
positioned directly under the cable (surveyor B can make a position check by sighting
past the string of a plumb bob, held in his or her outstretched hand, to the cable); surveyor A sets the clinometer to 45°and then backs away from surveyor B until the over-
head electrical cable is on the cross-hair of the leveled clinometer. At this point,surveyors A and B determine the distance between them to be 36.5 ft (see figure). Surveyor A then sets the clinometer to 0°and sights surveyor B; this horizontal line of sight
cuts surveyor B at the knees, a distance of 2.2 ft above the ground.

Determine the ground
clearance of the electrical cable, show your work.

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