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A 6.5-m ladder AB leans against a wall as shown. Assuming that the coefficient of static friction µs is the same at A and B, determine the smallest value of µ for which equilibrium is maintained.
a rocket has an initial mass of 25000 kg of which 20000 kg is fuel and oxygen. it is propelled directly upward from
The parting line in injection molding is which one of the following: (a) the lines formed where polymer melt meets after flowing around a core in the mold, (b) the narrow gate sections where the parts are separated from the runner, (c) where the clam..
A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir at TC = 280 K and rejects energy QH to a hot reservoir TH = 330 K. For each of the following cases determine whether the cycle operates reversibly, irreve..
Two kilograms of air within a piston-cylinder assembly execute a carnot power cycle with maximum and minimum temperatures of 750k and 300k, respectively.
tank a initially contains 100 gallons of pollutant and no water. pure water flows from a source to tank a at a rate of
A piston-cylinder device holds 2 kg of refrigerant fluid R-134a, initially at 500 KPa. At this state, 0.5 kg of the fluid is in the liquid phase. Heat is then added to the fluid at constant pressure to increase its temperature to 60 c.
Disregarding the effect of gravity and the shear forces, determinethe horizontal force F needed to hold the cone stationary.
Air is expanded from 1.5MPa and 177°C to 90kPa in an adiabatic turbine. Determine the isentropic efficiency of this turbine if the air is exhausted at 0°C
steam at 160 bar 520 degrees celsius and with a mass flow rate of 250 kgs enters a turbine operating at steady state
methane at 77 f 1 atm enters an insulated reactor operating at steady state and burns with the theoretical amount of
Determine the nature of the relationship between these variables and Determine the operating point for this pump with this system - Calculate the efficiency of each pump.
A constant-area duct is fed by a converging-only nozzle. The nozzle receives air from a large chamber at p1=600 KPa and T1=550 K. The duct has a friction length of 5.3, and it is choked at the exit. What is the pressure at the end of the duct? If 80 ..
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