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CE130 - Midterm Solutions

CE130 - Midterm Solutions - CE/CEM130 Fall 2008 Dept of...

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CE/CEM130 – Fall 2008 Name: _________________________________ Dept. of Civil Engineering & CEM California State University, Long Beach Midterm Exam (Total = 100 pts) Highest = 100 Lowest = 30 Average = 80.5 Circle the most appropriate answer for the following questions (5 pts each). Note: Please provide your calculations (if any), for partial credits, in the space given under each question: 1. Levels and rods can be used to determine ____________ A) differences in elevations B) horizontal angles C) vertical angles D) All of the above 2. Using a clinometer, Joe measures a 40 o vertical angle to Bill standing on top of a nearby hill. It took Bill 712 paces to get to the top of the hill and 714 paces coming back. If Bill's calibrated pace is 2.66 ft/pace, the height of the hill Bill climbed from where Joe stands is _________ A) 1450 ft B) 942 ft C) 1219 ft D) 1590 ft Aveg number of paces = (712 + 714)/2 = 713 paces Slope distance = 713 x 2.66 = 1896.58 ft Height of the hill = 1896.58 x (sin 40 o ) = 1219 ft 3. Sin(56° 18' 31" ) or sin(66 o 28’41”) approximately is: Sin(56 + 18’/60 + 31”/3600) = sin(56.3086) = 0.8320 Sin(66 + 28’/60 + 41”/3600) = sin(66.4780) = 0.9169 4. Refer to the Figure of level rod: The rod reading is ____________________ Reading = 1.85 ft 1 50.2 ft EN2
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