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During a certain activity, a hinged knee prosthesis (material is CoCr - Endurance Strength = 330 MPa) is subjected to a cyclically varying bending moment with a mean value of 0 N mm. The maximum bending moment acting on the stem of the prosthesis is equivalent to the body weight of 700 N acting at 40 mm from center of the stem. The stem is assumed to have a square section of side 11 mm. Is there any likelihood of a stem fracture? Use the most conservative fatigue failure criteria.
An inventor wants to increase the efficiency of wood burning stoves by reducing the energy lost through the exhaust stack. He proposes to accomplish this by attaching fins to the outer surface of the chimney, as shown schematically below.
a plate 50 mm wide and 15 mm thick is loaded in tension. the plate is made from steel with yield strength of 1500 mpa
a closed rgid tank contains 3kg of saturated water vapor initially at 140c. heat tranfer occurs and the pressure drops
a specimen of material a in a tension test elongates from an original length of 2.2 to a length l uniformly after which
a 0.4m3 rigid tank initially contains refrigerant-134a at 14 degree c. at this state 70 of the mass is in the vapour
The dam is to be built such that the estimated average flow over its crest will be Q = 3000 m^3/s. Determine the required flow over the crest of a model built to a scale of 1/25
a small model of a pump is tested in the laboratory and found to have a specific speed n equal to 1000 when operating
air with a mass flow rate of 10 lbms enters a poorly insulated nozzle operating at steady state with a temperature of
design a symmetric 4-bar mechanism optimized for a constant velocity of 150 insec over a straight line motion of 8 such
a four cylinder 2.4 liter engine operates on a four stroke cycle at 3200 rpm. the compression ratio is 9.41 the
saturated steam at 2 mpa is contained in a piston-cylinder device. the initial volume is 0.25 cubic meters. heat is
propane gas enters a continuous adiabatic heat exchanger at 40degc and 250 kpa and exits at 240degc superheated steam
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