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A small motor, weighing 100 lb, is found to have a natural frequency of 100 rad/s. It is proposed that an undamped vibration absorber weighing 10 lb be used to suppress the vibrations when the motor operates at 80 rad/s. Determine the necessary stiffness of the absorber.
A spherical water droplet having a diameter of 1.3 mm is allowed to fall from rest in atmospheric air at 1 atm and 20C. Estimate the velocities the doplet will attain after a drop of 30, 60, and 300 m.
air compressor is a single acting two cylinder unit which takes in an air volume of 0.2 m3s. the initial absolute
Air is expanded from 1.5MPa and 177°C to 90kPa in an adiabatic turbine. Determine the isentropic efficiency of this turbine if the air is exhausted at 0°C
consider a horizontal pipe with a constant diameter. water constant density p 1000 kgm3 enters the pipe at
a steady tensile load of 5.00kn is applied to a square bar 12mm on a side and having a length of 1.65m. compute the
a rocket has an empty weight of 500lb and carries 330lb of fuel. if the fuel is burned at the rate of 1.3 lbs and
The owners of a house on a private lake are thinking of using "pumped storage" as a means of reducing their electricity bills. They will pump water from the lake up to a large reservoir overnight, and then during times of peak power prices, release t..
air conditioning on a university campus is provided by chilled water 10oc pumped through a main supply pipe. the pipe
the lifetime of a lightbulb is normally distrbuted with a mean of 1000 hrs and a standard deviation of 30 hours. find the probability that a randomly selected light bulb last longer than 1045 hours.
an air-standard diesel cycle is operated with a compression ratio odf 20. the heat input is 300 btulbm. at the
The 1200-lb trunk has a cen- ter of gravity at G. The felling notch at O is sufficiently large so that the resisting moment there is negligible.
the surface of a steel machine member is subjected to the stresses of sigma1100 mpa sigma220 mpa sigma3-80 mpa. what
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