C7-32 A truss is loaded and supported as shown in Fig. Plot the forces in members BC, BG, and GH of the truss as a function of angle e (0 s 0s 90°). 10 kN 3 m D 3 m |F 5 m -5m -5m -5m
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- Draw the free-body diagram of CBA and DBShow the complete free body diagram for the problem.A 415 kg safe is hanging from the apparatus below. Determine the tension in the cable. Dimension a=1.9 m and dimension b=2.5 m. The mass of the beam is 85 kg. Use g = 10 N/kg. Hint: Take torques about the hinge and use the perpendicular lever arm version of the torque equation (the sin theta version will work but will require more calculation).
- Make the free body diagram and calculate the reaction efforts at the points with movement restrictions imposed. Data: L1 = 1.9m L2 = 3.3m L3 = 3.5m P1 = 75kN P2 = 140kNinclude also the free body diagramThe jib crane is designed for a maximum capacity of 14 kN, and its uniform I-beam has a mass of 270 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 4.0 m. On the same set of axes, plot the x- and y-components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work. (You can disregard the plot, I only need a, b, c, and d)
- The jib crane is designed for a maximum capacity of 7 kN, and its uniform I-beam has a mass of 240 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 3.7 m. On the same set of axes, plot the x- and y-components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work.(a) What is the value of R when x = 1.9 m?(b) What is the value of R when x = 3.2 m?(c) Determine the minimum value of R and the corresponding value of x.(d) For what value of R should the pin at A be designed?The homogenous bar A having a mass of 18 kg is 2 m long and is inclined at 60 degrees with the horizontal plane. The mass M of 7 kg is connected by the rope to the bar. The rope leaving the bar is horizontal. The coefficient of friction between the rope and the drum B is 0.20. What is the minimum coefficient of friction between the bar and the plane for equilibrium? Give solution. (Ans. coefficient of friction = 0.284)Draw the free body diagram of this problem
- A rear suspension system for a front wheel-drive vehicle is shown here. Spring EF is offset behind member CD. The normal force due to contact between the wheel and the road is 4200 N. Assume the weight of the wheel and suspension system components is negligible. Determine the magnitude of the member CD. Is the member in tension or compression? Determine the support reactions at A. Determine the unstretched length of the spring EF given a spring constant of 150 kN/m.A homogenous bar with length l and weight w lb rests horizontally as shown in Fig 9-37 with its free end on a block of weight W, the block W is at rest on a plane inclined at the angle α with the horizontal. Determine the necessary coefficient of friction μ between the block and the plane for equilibrium. Assume no friction between the bar and the block. Give solution. [Ans. μ=(sin 2α) / (w / W+2 cos2 α)]Find the stable equilibrium position of the system described in Prob. 10.56 if m = 2.06 kg.