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An elevator weighs 1000lb and carries a load of 600 lbs and decends at 20ft/s. The cable that supports the elevator has a design load of 2500lb. Use the impulse momentum equation and determine the time it will take the elevator to stop?
a full-revolution press has 100 rpm flywheel rotation. the press is equipped with two-hand palm buttons mounted on the
estimate the land area required to grow willow that would provide 1 gw of power in a region where the annual solar
What volumetric flow rate of fuel gas is required if there are no heat losses to the surroundings?
one end of a tube is closed and the other is open. a 15 g projectile is placed near the closed end is fastened in place
the weight of a water tank open to the atmosphere is balanced by a counterweight equidistant from the fulcrum. there is
a piston-cylinder assembly contains a 2 phase liquid-vapor mixture of water initially with a pressure of 500 kpa and a
germanium forms a substitutional solid solution with silicon. compute the weight percent of germanium that must be
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift?
a copper rod 50mm long and 5mm in diameter extends horizontally from a casting at 300 c. the rod is in an air
twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 f. the gas mixture
a 50 kg copper block initially at 350 c is quenched in a closed rigid insulated tank containing 120 l of liquid water
a seismic instrument has a natural frequency of 20 hz and a damping ratio of 0.65. determine the maximum input
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