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The armature of a variable-speed electric motor, of mass 200 kg, has an unbalance due to manufacturing errors. The motor is mounted on an isolator having a stiffness of 10 kN/m and a dashpot having a damping ratio of 0.15.
(a) Find the speed range over which the amplitude of the fluctuating force transmitted to the foundation will be larger than the exciting force.
(b) Find the speed range over which the transmitted force amplitude will be less than 10 percent of the exciting force amplitude.
A jumbo jet with a mass of 5 million kg requires a speed of 175 mph for takeoff. Assuming an overall efficiency of 20% (from heat release to kinetic energy of the aircraft), determine the amount of jet fuel (heating value: 44 MJ/kg) consumed during t..
an electric wire made of c14500 copper is stretched between two street supports at 20degc so that a stress of 40 mpa is
Compute an equilibrium where the price of good 1 is 1. The equilibrium price of good 2 and the equilibrium allocations will be formulas in terms of the endowments. (Hint: The endowments of good 1 are so large that each consumer consumes a positive..
the displacement vectors 46.0 cm at 15.0deg and 23.0 cm at 56.0deg both start from the origin and form two sides of a
the turbine of a steam power plant operating on a simple ideal rankine cycle produces 1750 kw of power when the boiler
a nozzle discharges a stream of water of cross-sectional area a with a velocity va. the stream is deected by a single
in a rankine cycle with reheat steam at 500c expands in a high pressure turbine until it reaches the saturated vapor
Consider the jib crane shown in the given image, where it is supported by a pin at C and rod AB. The maximum tension allowed in the rod is 60 kN and the maximum rated force in the pin C is 80 kN. The load has a mass of 2000 Kg with its center of m..
a diesel engine uses 54.4 kg of fuel oilh of calorific value 45 mjkg. the thermal efficiency of the engine is 25.
a solid circular drive shaft 2 m long transmits 560 kw of power from the turbine engine of a 25 kn helicopter to its
an iron-carbon alloy gear is being hardened by carburization at 1000 oc. calculate the time in hours necessary to
1 a 500 ml cylindrical mug is filled level with the top of the mug with 90degc water. what is the water level relative
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