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A machine supported symmetrically on four springs has a mass of 80 kg. The mass of the reciprocating part is 2.2 kg which moves through a vertical stroke of 100 mmwith simple harmonic motion. Neglecting damping, determine the combined stiffness of the springs so that the force transmitted to the foundation is 1/20 th of the impressed force. The machine crank shaft rotates at 800 rpm. If under actual working conditions, the damping reduces the amplitudes of successive vibrations by 30% , find: (i) The force transmitted to the foundation at 800 rpm (ii) The force transmitted to the foundation at resonance and (iii) The amplitudes of vibrations at resonance.
a vertical piston-cylinder assembly contains 0.3 kg of air k1.4 r287 jkgk initially at 155 kpa and 27 degree c. the is
highways are banked to increase the maximum safe speed at which cars can negotiate a turn. assume a road with radius of
a closed steel bottle contains carbon dioxide at -20c x20 and the volume is 0.05m3. it has a safety valve that opens at
Assuming the dry unit weight of sand to be 16 kN/m3, estimate the average peak friction angle, f 9, of the sand. Use Eq. (3.53).
in each case calculate the biot number for the object and indicate whether or not the lumped approximation is valid.a a
when the 35-kg cylinder is released from rest the spring is subjected to a tension of 75 n.a determine the speed of the
three bolts are used in the connection shown in the figure. the thickness of plate 1 is 15 mm. the ultimate shear
the reliabilities of two alternative system configurations are to be evaluated . the first consists of two compnants in
Steam enters an adiabatic turbine at 6 MPa, 600°C, and 80 m/s and leaves at 50 kPa, 100°C, and 140 m/s. If the power output of the turbine is 5 MW, determine (a) the reversible power output and (b) the second-law efficiency of the turbine. Assume t..
Methane (CH4) is burned with dry air. The volumetric analysis of the products on a dry basis is 5.20 percent CO2, 0.33 percent CO, 11.24 percent O2, and 83.23 percent N2. Determine
the wheel in fig. 10-27 has eight equally spaced spokes and a radius of 30 cm. it is mounted on a fixed axle and is
if f1 110n f2 121n and f3 85n determine the magnitude and coordinate direction angles of the resultant couple
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