Angkasa, Aurora, Awan ,dan Aku

2/120. Two cars travel at constant speeds through a curved portion of highway. If the front ends of both cars cross line CC at the same instant, and each driver minimizes his or her time in the curve, determine the distance d which the second car has yet to go along its own path to reach line DD at the instant the first car reaches there. The maximum horizontal acceleration for car A is 0.60g and that for car B is 0.76g. Which car crosses line DD first? 2/121. The fi gure shows a portion of a plate cam used in the design of a control mechanism. The motion of pin P in the fi xed slot of the plate cam is controlled by the vertical guide A, which travels horizontally at a constant speed of 6 in. /sec over the central sinusoidal portion of the slot. Determine the normal component of acceleration when the pin is at the position x = 2 in. 2/122.  A football player releases a ball with the initial conditions shown  in the figure. Determine the radius of curvature of the trajecto...

 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 ...

 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 i...

 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?