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Two boys push on the gate as shown. If the boy at B exerts a force of FB = 30 lb, determine the magnitude of the force FA the boy at A must exert in order to prevent the gate from turning. Neglect the thickness of the gate.
1.5 kg of ethane at 150 kpa 300k is heated in a two-step process using a source at 1600k. the first step is a constant
an air conditioner is used to cool and dehumidify air. we will ignore the temperature aspect and model the air
refrigerant 134a enters an adiabtic compressor as a saturated vapour at -20degree c and exits at 1mpa pressure. if the
a double-acting cylinder has a piston with a diameter of 25 mm. the piston rod is 5 mm in diameter and pressure is
n2 is described by its state properties of temperature -100 deg c and pressure 10.0 mpa. determine if it is
there are two gears one with radius r and the other with radius 2.2r. the larger hear is subjected to an external
danica traveling at a speed of 200 kmhr on a straight road applies brakes to her car at point a and reduces her speed
a spring is stretched in 1.5 in. by a 4 lb weight. let the weight be pulled down 3 in. below the equilibrium level nd
oxygen is stored in a rigid tank with a volume of 10 m3 . the pressure and temperature in the morning are measured as
we have a mixture that is 20 mol propane 35 mol n-butane and 45 mol n-hexane. if a flash drum operates at 400 kpa what
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
a 0.5-in.-diameter steel e 30000 ksi bolt 1 is placed in a copper tube 2 as shown in fig. p5.47. the copper e 16000
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