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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.
Determine the power produced by this turbine in kW. Assume that air is ideal but use both variable and constant specific heats to answer this question and compare your results.
What would be the actual velocity of the air at the exit with the results obtained above? If you were to use this exit velocity what result would you get for your temperature at the exit?
Determine the rate of work done by the steam during this process in MW. You have 3 states of gas but pay close attention to your mass flow rates when using the energy equation. Also, assume that the
Compressor looses heat to surroundings at rate of 1kw. Determine: Mass flow rate at inlet, Mass flow rate at exit, Volumetric flow rate at exit.
At cold, liquid water enters at 15C and 1 bar, and leaves at 40C and 1 bar. m for hot is 2kg/sec. At what rate is heat transfered from the hot to the cold? Estimate the mass flow rate in the cold pi
Determine the angular velocity Wbc of rod BC and the velocity of collar A relative to rod BC rod is 250-mm and angles are 45 and 60 sliding rod is angle 60 and the rod OA is at 45 deg.
Calculate the net reaction force components due to the hinge(s) in the x, y, and z directions. Assume the coordinates of A are (0,0,4) and B are (2,4,2).
Determine the heat supplied to the heat engine by the heat source, in kJ, and the temperature of the heat source, in oC.
If the compressor consumes 1.2 kW of power, determine (a) the COP of the heat pump, and (b) the rate of heat absorption from the outside air.
Determine the Reynolds number if the average velocity is 20 diameters per second. (b) Repeat the calculations if the tube is a nanoscale tube with a diameter of D = 150 nm.
The heat loss is passed to the surroundings which is at 27 C. a. Determine the change in entropy of the air passing through the device. b. is the process reversible?
In a mixing chamber, 0.2kg/s of steam at 100kPa and 160oC mixes with 10kg/s of water at 100kPa and 50oC to produce water at 100kPa and 60oC at the outlet.