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A 110 kg machine is mounted on an elastic foundation with stiffness of 2106 N/m. To determine the damping that the machine is subjected to, an external harmonic force of 1500 N magnitude is applied to it at a rate of 150 rad/s. The vibration of the machine is measured at 1.9 mm. Determine the damping ratio.
steady-state creep rate data are given for an alloy taken at 474 k with the activation energy for creep of 140000
a 850-kg meteoroid happens to be composed of aluminum. when it is far from the earth its temperature is -13.5 degc and
Ammonia at 10ºC and mass 10 kg is in a piston cylinder with an initial volume of 1 m3. The piston initially resting on the stops has a mass such that a pressure of 900 kPa will float it. Now the ammonia is slowly heated to 50ºC. Find the final pressu..
hot combustion gases enter a gas turbine at .8mpa and 1500 k at a rate of 2.1 kgs and exit at .1 mpa and 800 k. if heat
A group of 20 students attend class in a room which measures 7m x 7m and has a 3 m ceiling height. Assume that each student occupies 0.07 m3 and gives out 400 kJ of heat per hour. Calculate the air temperature rise occurring within 15 min of the star..
A piston-cylinder device has an initial contained volume of 0.1 ft3 and contains steam at an initial state of 160 psia, 500°F. The steam is then expanded to 20 psia, 0.65 ft3 and as a result of this process 0.50 Btu of heat is transferred to the syst..
consider the combustion of octane c8h18 with air o2 3.76 n2i. write and balance the stochiometric equation assuming
a knoop microhardness measurement was made on a sample that resulted in a khn of 481when a load of 5120 kg was applied.
a how would you define a system to determine the temperature rise created in a lake when a portion of its water is used
a mass m is suspended from a spring of stiffness 4000nm and is subjected to a harmonic force having amplitude of 100n
A small ceramic crucible (mass of 0.26 kg) has just been washed and rinsed. Before it can be reused, it must be absolutely dry. To ensure that no residual water is present, the crucible is heated to 150 C from room temperature (23 ?C). How much heat ..
the surface of a steel gear made of 1020 steel 0.20 wt c is to be gas-carburized at 927 deg c. calulate the carbon
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