Tugas Mekanika Kekuatan Bahan 1

1.3 Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Determine the magnitude of the force P for which the tensile stress in rod AB has the same magnitude as the compressive stress in rod BC.

1.14 A couple M of magnitude 1500 N ? m is applied to the crank of an engine. For the position shown, determine (a) the force P required to hold the engine system in equilibrium, (b) the average normal stress in the connecting rod BC, which has a 450-mm2 uniform cross section.

1.41 Link AB is to be made of a steel for which the ultimate normal stress is 450 MPa. Determine the cross-sectional area of AB for which the factor of safety will be 3.50. Assume that the link will be adequately reinforced around the pins at A and B.

1.66 The 2000-lb load may be moved along the beam BD to any position between stops at E and F. Knowing that sall 5 6 ksi for the steel used in rods AB and CD, determine where the stops should be placed if the permitted motion of the load is to be as large as possible.

1.69 The two portions of member AB are glued together along a plane forming an angle u with the horizontal. Knowing that the ultimate stress for the glued joint is 2.5 ksi in tension and 1.3 ksi in shear, determine the range of values of u for which the factor of safety of the members is at least 3.0.

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Tugas Termodinamika 2

Example 2.2 Four kilograms of a certain gas is contained within a piston–cylinder assembly. The gas undergoes a process for which the pressure–volume relationship is The initial pressure is 3 bar, the initial volume is 0.1 m3 , and the final volume is 0.2 m3 . The change in specific internal energy of the gas in the process is u2 u1 4.6 kJ/kg. There are no significant changes in kinetic or potential energy. Determine the net heat transfer for the process, in kJ. Example 2.3 Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of .09 m2 . Electric current passes through the resistor, and the volume of the air slowly increases by .045 m3 while its pressure remains constant. The mass of the air is .27 kg, and its specific internal energy increases by 42 kJ/kg. The air and piston are at rest initially and finally. The piston–cylinder ...

Tugas Termodinamika 1

Pertanyaan : 1. Perbedaan tekanan dan tegangan 2. Jelaskan cara kerja : Turbojet Engine Refrigerator/ Kulkas Electric power plant Automobile 3. 1 Psi berapa pascal ? 4. Berapa tekanan gauge (Pg) untuk vakum dan Pg untung yang tekanan absolutnya diatas 1 atm 5. Jika Pg= 6000KPa , maka L yang diperoleh untuk air dan air raksa ialah?

Angkasa, Aurora, Awan ,dan Aku

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