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A lathe can be modeled as an electric motor mounted on a steel table. The table plus the motor have a mass of 50 kg. The rotating parts of the lathe have a mass of 5 kg at a distance 0.1 m from the center. The damping ratio of the system is measured to be ζ = 0.06 (viscous damping) and its natural frequency is 7.5 Hz.
Calculate the amplitude of the steady-state displacement of the motor, assuming ωr = 30 Hz.
the heat-transfer rate to the surroundings from a person at rest is about 100w. supposed the ventilation system fails
1. The activation energy for the diffusion of cop- per in silver is 193,000 J/mol. Calculate the diffusion coefficient at 1200 K (927°C), given that D at 1000 K (727°C) is 1.0 X 10-14 m2/s.
the 680 kg load suspended from the helicopter is in equilibrium. the aerodynamic drag force on the load is horizonal.
A fourth-order polynomial passes through the five points for which the independent and dependent variables, x and y, respectfully, are given (-2,37), (-1,7), (0,5),(1,13), and (2,61). Find the polynomial by any suitable method. Here, x represents the..
What are the two general mass and energy balance equations, written in rate form, and when is it appropriate to use this form? What are the two general mass and energy balance equations, written in magnitude (finite difference) form and assuming unif..
the lowest temperature that has been achieved is about 1 times 10-6 k. to achieve this an additional stage of cooling
A similar measurement is made applying the force parallel to one of the cube axes. Explain why the two measurements give different values of the elastic modulus.
An ideal Ericsson engine using helium as the working fluid operates between temperature limits of 550 and 3000 R and pressure limits of 25 and 200 psia. Assuming a mass flow rate of 14 lbm/s determine
a rigid 1.0 m3 tank contains water initially at 120oc with 50 liquid and 50 vapor by volume. a pressure-relief valve on
a wet compression refrigeration cycle uses hfc-134a as the working fluid and operates between 75 f and 8 f. use a mass
A cylinder contains 1 kg of a certain fluid at an initial pressure of 20 bar. The fluid is allowed to expand reversibly behind a piston according to a law PV^2=constant until the volume is doubled. The fluid is then cooled reversibly at constant pres..
minimum weight design of a variable shape three-bar truss.numerical solution using the matlab optimization toolbox
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