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A helmet has an open cell polystyrene foam liner that is design to absorb the kinetic energy from an impact. The Foam has a relative density of 10% and the young module of the solid polystyrene that the foam is 1.5Gpa. How much energy per volume in J/m^3, can the foam absorb if it is loaded in uni axial compression to uni axial compression to strain 80%, please assume that C1=1.0 and C2=0.05
If the filling is done rapidly, calculate the final temperature in the small cylinder, (a) assume that oxygen is an ideal gas with Cv= 5R/2 and (b) using accurate thermodynamic data for oxygen.
a stunt driver travels a total distance of 1172 feet moving at a constant speed of 40 miles per hour while weaving
a paper mill has two steam generators one at 4.5mpa 300 c and one at 8mpa 500 c. each generator feeds a seperate
a 200 3 250-mm panel of mass 20 kg is supported by hinges along edge ab. cable cde is attached to the panel at c passes
air at a velocity of 35. 2 ft sec and a pressure of 793. 1 nun hg flows in a long circular pipe whose inside diameter
a stone of 20 kg of mass is held 15 m above a tank containing 200 kg of water. the stone water and the air are at the
A power plant with one closed FWH has a con- denser temperature of 450C, a maximum pressure of 5 MPa, and a boiler exit temperature of 900C. Extraction steam at 1 MPa to the FWH condenses and is pumped up to the 5-MPa feed water line, where all the w..
A 1 kg sphere of iron at 1000 degrees Celsius is quenched in a 10 kg bath of oil at 100 degrees Celsius. Assume that no heat is lost to the surroundings and the temperature of the oil is uniform. Calculate the final equilibrium temperature of the iro..
A solar energy collector produces a maximum temperature of 100°C. The collected energy is used in a cyclic heat engine that operates in a 5°C environment. Estimate the thermal efficiency if the engine operates at 40% of Carnot efficiency. How would t..
At what equivalence ratio for octane-air mixtures does the carbon to oxygen ratio of the system equal one? Why is this of interest?
Mechnical Vibration Analysis, How do I deduce the value of the viscous damping factor? How do I deduce the value of the viscous damping coefficient c?
Consider a one-dimensional plane wall at a uniform initial temperature Ti. The wall is 10 mm thick, and has a thermal diffusivity of 6 x 10^-7 m2/s. The left face is insulated, and suddenly the right face is lowered to a temperature Ts,r.
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