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The cage of a mine hoist descends part of a shaft with an acceleration of 1 m/s2 and the remainder of the distance with a retardation of 2 m/s2. The total time taken for the descent is 60 s.
What is the density of liquid Al-11.6%Si alloy at the melting temperature? What is the solidification shrinkage for the Al-11.6%Si alloy? Why are Al-Si alloys one of the most popular foundry alloys?
The discharge is located 20 ft (6 m) higher than the entrance. What is the pressure difference between the two ends of the pipe?
Determine the number of revolutions it must undergo to acquire a clockwise angular velocity of 18 rad/s. b) What time is required?
The steel bolt and anchor assembly is used to reinforce the roof of a passageway in an underground coal mine. in installation the both is tension ed to 5000lb.
If the coefficient of performance of the heat pump is 9 and the heat engine only produces enough work to drive the heat pump, then find: a). the rate of heat transfer to the heat pump from the 40oF
Determine the following: I) The total amount of energy transfer by work (kJ) II) The total amount of energy transfer by heat (kJ)
Calculate the COP for the refrigeration cycle. Calculate the rate of heat transfer (Btu/hr) from the refrigerant to the room. (c) Calculate the power (Btu/hr) to run the cycle and the heat transfer
Evaluate the work and heat transfer for the process, in Btu. Is this process a violation of the Kelvin-Planck statement of the second law of thermodynamics? Explain why or why not.
An 8 lbm box is moving around the circle of radius rA = 2 ft with a speed of vA = 5 ft/s while connected to the end of the rope. Calculate the total velocity of the box at the instant it reaches point
Same exit pressure of 1 bar produces 90% of the work produced by the turbine in part a. What is the termperature of the exit steam, what fraction of the steam exiting the turbine is vapor, and what
Accounting for the change is void fraction, does this explain the difference in pressure drop? What else could be the cause? Provide detailed explanation along with calculations.
Calculate the volume flow rate of water if the pressure at A is 120 psi and the pressure at B is 105 psi. Use Darcy-Weisbach for this analysis.
Calculate the isentropic efficiency of the turbine if the exhaust temperature of air is 60 °C. Assume that the average specific heat Cp for air during the process is 1.013 kJ/kg°C.
Consider a steam turbine where steam enters with a pressure of 10 MPa and temperature 500 °C, and expands adiabatically to 5 kPa. The isentropic turbine efficiency is 80%. Determine the turbine
Determine the density, specific heat, and thermal conductivity of a lightweight aggregate concrete mix that is composed of 65% stone mix concrete and 35% air by volume. Evaluate properties at T = 3
Ii is to be mounted on a solid steel shaft with a heavy force fit. Specify the dimensions for the shaft and sleeve, and compute the stress in the sleeve after installation. Use the basic hole system
Looking at the different convergence methods, which convergence method, polynomial order, and/or meshing would you recommend in order to obtain a converged solution for solving maximum deflection of
Determine a suitable length for the bolt, rounded up to the nearest 1/4 inch. What percentage of an external load on the assembly will be supported by the bolt? What external load will cause separat
An engineer is designing a system that requires transporting .01 m^3/s of helium at 15°C and 120 kPa. The velocity of the pipe is limited to 40 m/s. What size (diameter) of pipe is needed?
Determine the resulting force created by the vehicle and exiting sand if the sand exits at a velocity of 0.24 m/s relative to the vehicle. Assume that the vehicle is free to roll and friction is neg
Assuming the wheels do not slip on the ground, determine the angle \theta of the largest incline the jeep can climb at a constant speed v = 30 ft}/s.
The automobile shown has 1200kg mass with center of gravity at point G and all wheel have the same 0.34m radius if the automoble has rear wheel driver determine the reaction at each pair of wheel.
Determine (a) the exit velocity of the nitrogen and (b) the ratio of the inlet to exit area A /A2. What is the exit velocity? What is the ratio of the inlet to exit area A1/A2?