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A man tried spinning a ball round and round in the air at the end of a unknown material (its a rope like structure) but the stress from the centrifugal forces exceeded the yield strength of the ball. Now we have to find a new material so he can spin the ball at the highest angular velocity. Derive an index to choose a material that will allow for maxiumum angular velocity.
if a particles position is described by the polar coordinates r 2 sin 2u m and u 4t rad where t is in seconds
consider a small simple rankine power cycle which produces 600kw power from an electric generator with an efficiency of
a machine table driven by closed loop positioning system consists of a motor gearbox lead screw and an optical encoder.
a heat pump is used to maintain a house at a constant temperature of 23degc. the house is losing heat to the outside
the melting temperatures for various materials are listed in the inside cover of callister. some representative values
in a carnot cycle heat is supplied at 350degc and rejected at 27degc. the working fluid is water which while receiving
the aluminum plate of thickness t 3.5 mm. is to be designed so the maximum stress remains below 100 mpa. the hole must
water enters an adiabatic turbine steadily as a saturated vapor at a pressure of 5 mpa and exits at a pressure of 0.1
Air at the rate of 18 kg/s is drawn into the compressor of a jet engine at 55 kPa and -23oC and is compressed reversibly and adiabatically to 276 kPa. Determine the required power input to the compressor expressed in horsepower.
consider incompressible viscous flow between two very long plates separated by a distance h. the bottom plate is
block c starts from rest and moves downward with a constant acceleration. knowing that after 5 s the velocity of block a relative to block d is 8 ft/s, determine a) the acceleration of the block c. b) the acceleration of portion e of the cable.
a gymnast having a mass of 80 kg holds the two rings with his arms down in the position show as he swings downward. his
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