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Ammonia vapor flows through a valve. It enters the valve at a pressure of 8 bar and a temperature of 120C and after going through a throttling process it exits at a pressure of 3.5 bar.
A compressor pressurizes air from 1 atm to 2.38 atm at steady state. At the entry the air's temperature is 70F, whereas at the exit it has quadrupled (in degrees F). At the entry the air's volumetri
A wood cube with 9 inch sides is inserted into water. The specific gravity of wood is 0.60. What force will need to be applied to the block downward to hold the wood cube completely submerged in wat
A train of total mass equal to 500 Megagrams starts from rest and accelerates uniformly to a speed of 90 km/h in 50 s. After reaching this speed, the train travels with a constant velocity.
If the bar is 90 degrees F. If the bar is cooled to 40 degrees F, what is the maximum normal stress in the bar and what is the maximum shear stress alpha = 13*10^-6 /degF, E = 10*10^3 ksi
Imagine a slide with a radius of 1.5 m and a vertical drop of 2 m per turn. Further suppose that one of my daughters is sliding down at a constant speed of 2 m/s
Ethylene enters a turbine at 10 bar and 450 K, and exhausts at (atm) and 325 K. For mass flow in = 4.5 kg s^-1, determine the cost C of the turbine. State any assumptions you make. Data: H1 = 761.1
Refrigerant 22 is used in the evaporator pipe of a commercial refrigeration unit. At steady state it flows at a rate of 0.5 kg/s through the pipe of constant diameter. It enters the pipe at -10
Calculate the work necessary to compress air in an isolated cylinder from a volume of 6 ft^3 to a volume of 1.2 ft^3. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively
A paddle wheel, inserted inserted into the volume, does 720 KJ of work on the air. If the volume is 2 cubic meters, calculate the entropy increase assuming constant specific heats.
A 25 mm diameter steel cylinder falls under its own weight at a uniform rate of 0.1 m/s inside a tube of slightly larger diameter. Castor oil of viscosity 0.25 N.s/m2 fills the spacing between the t
A minimum contact time of 30 min is required to reduce the pathogen concentration from 100 pathogens/L to below 1 pathogen/L through a first-order decay process. You plan on treating water at a rate
A plastic-manufacturing plant emits 1,700 scfm of exhaust at 200oC and 90 kPa. The exhaust (consisting of mostly air) contains 9 ppm phenol vapor (C6H5OH). What is the concentration of phenol vapor
Exhaust gas from a chemical process flows at a rate of 8,000 actual cubic feet per minute (acfm) from point A at 250°F and 1 atm pressure. It flows through a circular duct to a fan
The gases are expanded to 140 kPa with a reversible adiabatic process. Calculate the work done by the gases, assuming they can be approximated by air with constant specific heats.
THe 50 kg crate is stationary when the force P is applied. Determine the resulting acceleration of the crate if (a) P=0, (b) P=150 N, and (c) P=300 N
Find the velocity of the air downstream of the restriction, and show that the enthalpy is essentially the same before and after the throttling process. Also find the change of entropy.
Consider the steady-flow energy equation applied to the given extrusion process. Since the die is horizontal then there will be no change in potential energy from inlet to outlet. Hence the potentia
If r = (theta)2 and theta = 2t, find the magnitude of r dot and theta double dot when t = 2 s
At what depth will water flow in a 10 m wide rectangular channel, if n=0.01, S=0.0015 and Q=9m^3/s
An irrigation channel is constructed of earth and is 8.1km long and has a capacity of 10 m^3/s for a flow depth of 2m. The cross section is trapezoidal with a bid width of 8 m and side slopes of 2
A trapezoidal channel with base width 5m and side slopes 2 horizontal to 1 vertical, slopes at 0.0005. If n=0.010, what is the flow rate for a normal depth of 1m, 2m, 4m
Water flows uniformly in a 6 m wide rectangular channel at a depth of 0.8m. The channel slope is 0.0015 and n=0.014. Find the flow rate in m3/s
The wastewater treatment plant for Pine City discharges 1 × 105 m3/day of treated waste to the Pine River. Immediately upstream of the treatment plant, the Pine River has an ultimate CBOD of 2
using the principles to developed in chapter 3 on equilibrium, one can determine that the tension in cable AB is 143.4 N. Determine the moment about the x-axis of this tension force acting on point