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Two construction workers each of mass m raise themselves on a hanging platform using pulleys as shown above. If the platform has a mass of 0.9 m, the initial distance between the pulleys and the platform is d, and the workers each pull with a force f on the ropes, what is the acceleration a of the workers? Assume the pulleys and ropes are massless.
superheated ammonia enters an insulated nozzle at 200c and 800kpa. the flow through the low velocity inlet is at
consider the combustion of methane using 20 excess air with a methane conversion of 85. air enters at 300oc and methane
an insulated vertical piston-cylinder device initially contains 10kg of water 6kg of which is in the vapor phase. the
find the average velocity of flow at section B, and the pressure difference between sections A and B.
a 10 cm long circular pin kfin20 wmtimesk of 12-mm dia removes 53watts of heat from a hot base when the average
A closed gas turbine unit uses neon as the working fluid. There are two stages of compression with inter cooling from 480kPa and 290K to a maximum pressure of 2.75MPa with an intermediate pressure of 1149kPa. The regenerator has an effectiveness of 6..
refrigerant 134a enters an adiabatic compressor as saturated vapor at 200kpa at a rate of 30 kgmin and is composed to a
a straight fin of uniform cross section is fabricated from a material of thermal conductivity k 5 wmk thickness w 20
a gaseous mixture consisting of 0.75 kmol of hydrogen and 0.25 kmol of nitrogen occupies 0.085 m3 at 25degreec
A steam turbine operates with 1.6 Mpa and 350 degree C steam at its inlet and saturated vapor at 30 degree C at its exit. the mass flow rate of the steam is 22 kg/s,and the turbine produces 12000kW of power.
a catheter is a specialised needle intended for long-term insertion into a vein in a patients arm. engineers are
during some actual expansion and compression processes in piston-cylinder devices the gases have been observed to
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