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An electric motor, of mass 60 kg, rated speed 3000 rpm, and an unbalance 0.002 kg-m, is to be mounted on an isolator to achieve a force transmissibility of less than 0.25. Determine
(a) the stiffness of the isolator,
(b) the dynamic amplitude of the motor, and
(c) the force transmitted to the foundation.
Two plates are suspended vertically in 20 C atmospheric air forming a channel of width 18cm. The plates are 3m high and are maintained at a temperature of 275 C. If the channel is 5 m deep, find the convective heat transfer in the channel
many bridge designs today contain simple geometrical components but are constructed into complex ways to ensure that
a vertical piston-cylinder device initially contains 0.25 m3 of air at 600 kpa and 300degc. a valve connected to the
a steam turbine has extractions to provide heating steam for the feedwater heaters in a power plant. the following
(a) Describe the equilibrium formally. (b) Prove that an equilibrium exists.
the field-circuit resistance and armature-circuit resistance of a 10-hp 115-v motor are 90 ohms and 0.08 ohms
Air enters the turbine of a gas turbine at 1200 kPa and 1200 K, and expands to two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1200 K. The expansion through each turbine stage is isentropic.
a spring is stretched in 1.5 in. by a 4 lb weight. let the weight be pulled down 3 in. below the equilibrium level nd
Vertical plane due to the action of the external moment and determine the external moment or force.
Determine the rated value of the power coefficient CP and compare this with the value at the Betz limit. Assume the air density ρ = 1.2 kg/m3
a rigid 1.0 m3 tank contains water initially at 120degc with 50 liquid and 50 vapor by volume. a pressure-relief valve
a 1 m3 rocket-propellant chamber is tilled with combustion gases at 3000 k and 7 mpa at the instant combustion ceases.
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