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What is the difference between pound mass and pound force. If there is a difference then what is it? If there isn't a different then why do we make a distinction between the two forces?
Combustion in a cylinder causes the pressure to increase, which moves the piston a distance (x) of 7 inches. The piston is held in place by a spring ( k=60lbfin) that was at its relaxed length before the combustion process. How much work did the expa..
A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. How much ener..
Air expands adiabatically through a nozzle from a negligible initial velocity to a final velocity of 325 ms-1. What is tje temperature drop of the air, if ar is assumed to be an ideal gas for which Cp= (7/2)R?
consider a compressor that receives saturated r-410a vapor at 0degc. the refrigerant leaves the compressor with a
a mass of 0.25 kg of co2 at a temperature of 300 k and pressure of 100 kpa is heated at constant pressure to a volume
an ideal chiller uses refrigerant 134a and operates between a low-side pressure of 36 psia and a highside pressure of
The entrance is inward projecting. What flow will be expected if the gate valve is one-half open?
a thermocouple located at the center of a long circular duct with a 10cm diameter has a spherical bead of 2mm diameter.
A Brayton gas turbine cycle has two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300K and each stage of the turbine at 1200K..
Since the order is a rush and there are two machines in the work center, it is decided to split the order and run it on both machines. Calculate the manufacturing lead time before and after splitting.
If the mass is broug9ht to rest, calculate the maximum rise of temperature in the air. What effects could lead to a lower temperature rise?
Design a logic diagram that incorporates the state of all four devices (S, D, M, and T ) and produces the correct on/off condition for the motor start-up.
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