Download Statics and Dynamics Exam 2 - MEEN2130 - Prof. Zhi-Gang Feng and more Exams Mechanical Engineering in PDF only on Docsity! General Instructions: 1. Answer the questions in the space provided. If you run out of room for an answer, continue on the back of the page. Please do not remove the staple. 2. Calculator and a oneside A4 size formula (no solutions to any problems) sheet are allowed, but no other reference material is to be used. You may also request formula and equations from me. 3. The exam has two parts and contains shortanswer and longanswer questions. Please read the directions of each part before you proceed. UNT College of Engineering MEEN2130 Statics and Dynamics EXAM #2 (Sample) Your Name___________________________________ UNT_ID (last four digits)____________________ 1 | P a g e Part I Enter the answer (including the unit if applicable) for each question into the space provided. It is advised to put your work on the exam sheets so you may get partial credits for having right procedures but incorrect answers. 1. For the truss shown below. a. List the zero force members; b. To determine the force in member CD and DE, we could use the Method of Joints and apply the equilibrium conditions for joint D since it only has two unknowns. Solve the force in member CD and member DE and indicate if it is tension or compression. Answer: Zero force members: FCD = ( ) FDE = ( ) 2. To find the force in member GF, we can use the Method of Sections by cutting the truss into two parts as shown in figure (a). Draw the FBD for the left part in figure (b) and find the force in member GF and indicate if it is tension or compression. Answer: (a) FBD on the graph (b) FGF = ( ) 4 | P a g e 7. Determine the height on the wall to which the firefighter can project water from the hose, if θ=40o and the speed of the water at the nozzle is 48 ft/s. Answer: (a) s = ( ) Part 2: Draw FBD if necessary, show all the steps, box your final answers. 2-1. Block A has a mass of 50 kg and rests on surface for which μs=0.25. If the coefficient of static friction between the cord and the fixed peg at C is μs=0.3, determine the greatest mass of the suspended cylinder D without causing motion. 5 | P a g e 2-2. The pedestrian bridge truss shown has 10 000N applied loads at points I, J, and K. Find the forces in member IJ and FG, show if they are compression or tension. 2-3. A particle travels along the circular path having a radius of 20 m at speed 4 m/s. For a short distance from A (A is also the start of s-coordinate, s=0), its speed is increased by v=(0.05s) m/s2 where s is in meters. When it has moved s = 10 m, determine a. The speed at s=10 m; b. The magnitude of its acceleration at s=10 m; c. Its average speed during this time period; d. Its average velocity during this time period.
