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The cross section of a trap door hinged at A and having a mass m and a center of mass at G is shown in the figure. The spring is compressed by the rod which is pinned to the lower end of the door and which passes through the swivel block at B. When () = 0, the spring is undeformed. Show that with the proper stiffness k of the spring, the door will be in equilibrium for any angle ().
minimum weight design of a variable shape three-bar truss.numerical solution using the matlab optimization toolbox
Air ?ows in a 20-cm-diameter duct at 120-C and 120 kPa with a mass ?ux of 5 kg=s. The circular duct converts to a 20-cm square duct in which the temperature and pressure are 140-C and 140 kPa, respectively. Determine the velocities in both section..
a buoy is attached to the ocean floor with a rope.the ocean currents exert a horizontal 1000-n force on the buoy. the
what four processes make up the ideal rankine cycle? what is happening in an actual power plant during the real
On the basis of your study, recommend especially promising natural refrigerants and areas of application where each is particularly well suited. Report your findings in a PowerPoint presentation - technical and economic factors and effects on th..
A three-point transverse bending test is conducted on a cylindrical specimen of a ceramic material that has a reported flexural strength of 533 MPa. If the specimen diameter is 4.4 mm and the support point separation distance is 50 mm, what is the ma..
1. write out the differences betweena close system and open systemgive one example and state what type of system it isb
air enters the duct of an air-conditioning system at 15 psia and 50f at a volume flow rate of 450 ft3min. the diameter
the concrete beam is reinforced with three 20-mm diameter steel rods. assume that the concrete cannot support tensile
an office building is found to gain 200000 btuh of heat on a hot summer day over the period from 6 a.m. to 6 p.m. the
The Energy Equation is an expression of conservation of energy. However, the terms of the equation have dimensions of length. Each of the terms is called “head”. Discuss in your own words how each of these “head terms” relate to energy, and how the o..
A cable drum for a crane is to rotate between 160 and 166 rpm. Design a gear drive for 25 hp in which the input pinion rotates at 925 rpm and the output rotates with the drum. The crane is expected to operate with a 50% duty cycle for 120 hours per w..
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