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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.
Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 32 °C with a low velocity and exits at 1 MPa and 367 °C with a velocity of 6 x 10^3 m/min. The compressor is cooled at a rate of 1800 kJ/min, and the power input to..
The university requires proof of compulsory vaccinations (including 2 shots of the MMR vaccine) for its students but not its faculty. Provide economic justification for this different approach to student and faulty vaccination requirements.
Calculate the rate of heat loss per foot and the thermal resistance for a 6-in. schedule 40 steel pipe covered with a 3-in. thick layer of 85% magnesia. Superheated steam at 300°F flows inside the pipe (hc = 30 Btu/h ft2 °F) and still air at 60°F is ..
a spring loaded device imparts an initial vertical velocity of 50 ms to a 0.15 kg ball. the drag force on the ball is
The 60W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of the air by 50Pa to maintain flow. The fan is located in a horizontal flow section whose diameter..
Problem 1: A metal plate is used to hold three 250kg blocks as shown. a) Determine the magnitude and point of application of a single force that is equivalent to the system of 3 blocks shown. b) the plate is supported by 3 vertical reaction forces..
air at 40oc 1 bar and a volumetric flow rate of 60 m3min enters an insulated control volume operating at steady state
a beer distributor incurs a penalty cost of 2 per case of shortage and a 1 charge per case left over in inventory at
tarzan king of the jungle mass 66.2 kg grabs a vine of length 14.6 m hanging from a tree branch. the angle of the vine
car is traveling around a curve with radius 2300ft at a speed of 86mph. the car suddenly accelerates at a rate of
a home buyer can afford to spend no more than 1500month on mortgage payments. suppose that the interest rate is 6 that
blood at 37degc enters the left ventricle lv of a skier at a rate of 100 mls. at time t 0 the skier steps outside and
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