Wright State University Fall 2014

Department of Mechanical and Materials Engineering

ME 2120 STATICS: MIDTERM EXAM 1

Open Book, Closed Notes, Do Not Write on This Sheet, Show All Work

All Results Must Show at Least Three Significant Digits

Problem 1 (30 points): The cable and pulley system shown is used by a camper to hoist a backpack into a tree

to keep it out of the reach of bears. If the weight of the backpack is W = 60 lb, determine the tension in cables AB and AC.

Problem 2 (35 points): The object at D is supported by boom AO and by cables AB, AC, and AD, which are

parallel to the x, y, and z axes, respectively. If the mass of object D is mD = 100 kg, determine the forces

supported by the boom and the three cables.

See back of this page for Problem 3.

Wright State University Fall 2014

Department of Mechanical and Materials Engineering

ME 2120 STATICS: MIDTERM EXAM 1

Open Book, Closed Notes, Do Not Write on This Sheet, Show All Work

All Results Must Show at Least Three Significant Digits

Problem 3 (35 points): If the structure shown is subjected to couple forces applied at points A and B and the

force applied at A is ⃗ ( ) ̂ ( ) ̂ ( ) ̂ lb, determine the moment of the couple about line a. Line a has direction angles θx = 72º, θy = 36º, and θz = 60º.