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Determine the change in specific entropy of the refrigerant, in kJ/kg-K. Can this process be accomplished adiabatically?
A slender bar of mass 12 kg and length of 1 m is pinned to its support at the bar center. Describe the motion of the bar (analytically) for all time t > 0. The bar is initially at rest at its equil
For this same component and alloy, what is the maximum allowable stress level when the critical internal crack length is 5.1 mm?
Applying gas model for air, determine at a steady state: a) the inles and exit velocities in m/s b) the mass flow rate in kg/s c) rate of entropy produced in kw/k.
Calculate the viscosity of the fluid. A capillary tube of 1.0 mm inner diameter is dipped in a beaker containing mercury at a temperature of 20°C.
The rod is in an air environment with T infinity = 23 degrees C and h= 50 W/m^2K and its other and extend into an insulating media. Determine the fin heat transfer rate.
Assuming the earth thermal conductivity is 1.2 W/m K and the surface temperature is 15 degress C estimate the heat loss from the pipe.
If a cylindrical 1045 steel bar is subjected to repeated compression/tension stress cycling along its axis under a load amplitude of 66,800 N, compute the minimum allowable bar diameter to ensure th
The steady-state creep rates at 473 K for an alloy is 2.5x10-3 (h-1) at 55 MPa and 2.4x10-2 (h-1) at 69 MPa. The activation energy for creep is 140 kJ/mol.
A fatigue test was conducted in which the mean stress was 70 MPa, and the stress amplitude was 210 MPa. a. Compute the maximum and minimum stress levels. b. Compute the stress ratio.
The two disks each have a mass of 25kg and are attached at their centers by an elastic cord that has a stiffness of k = 1.6kN/m . Determine the stretch of the cord when the system is in equilibrium
An aluminum sample having diameter of 0.505 inches and length of 2 inches is tested in tension. a) What is the yield strength b) What is the tensile strength c) What is the elastic strain at the yie
Determine the required diameter of the rod if the allowable tensile stress is 24ksi and the allowable elongation is 0.15 inches over a length of 10ft.
When is it more advantageous to have many motor units of only a few muscle fibers each? When is it more advantageous to have fewer motor units that have many muscle fibers?
Assuming that the flow is adiabatic and that the kinetic energy of the steam at the inlet is negligibly small, determine the inlet temperature if the inlet pressure is 300 kPa.
If air enters such a device at 300 kPa, 40 C, at a rate of 0.100 kg/s and air leaves one end at 100 kPa, 50 C, at a rate of 0.060 kg/s, what is the temperature of the air leaving the other end?
Calculate stress intensity factor for hoop stress of 6 inch longitudinal subsurface crack. The pipe is austenitic stainless steel schedule 40 304L.
A 61 person is in a head-on collision. The car's speed at impact is 20. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
The inside of the furnace is maintained at 500 degress C, and the outside wall is maintaine at 50 degrees C. Calculate the heat loss through the walls.
A rigid tank contains 500 Kg of liquid water initially at 87 C. Due to heat loss to the environment, the temperature falls to 47 C. Determine the irreversibility of the overall process, in KJ, if To
Now, if the original air undergoes a free expansion until the volume is tripled, determine the final availability of the air, in KJ, and the second-law effectiveness.
A 0.5 m^3 partially evacuated rigid tank contains atmospheric air at 0.04 MPa and 298K. The environmental state is 0.1 MPa and 298K. Determine the availability of the air within the tank, in KJ.
Determine the availability, in KJ/Kg, if To is 25 C and Po is 1 bar. The steam is now cooled in a rigid tank until the pressure drops to 40 bars by transferring heat to the environment.
What was the change in kinetic energy? How much work did friction do? What happened to the temperature of the surface of the box? Are you conserving energy? Explain.
If an actual heat pump requires 10 kW of power input for the same temperatures and same heat supplied from -7 , determine the actual COP and the actual heat rejected to the 29 reservoir, in kJ/s.