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A spring-loaded piston-cylinder device is initially filled with 0.13 lbm of an R-134a liquid-vapor mixture whose temperature is ?30°F and whose quality is 80 percent. The spring constant in the spring force relation F = kx is 37 lbf/in, and the piston diameter is 12 in. The R-134a undergoes a process that increases its volume by 50 percent. Calculate the final temperature and enthalpy of the R-134a
500kg of air at 35 degrees Celsius dry-bulb and 20 degrees Celsius wet-bulb temperatures is cooled to 13 degrees Celsius dry-bulb and 90% relative humidity. Decide the amount of heat transfer from the air in MJ
A paper clip is made of wire 0.7 mm in diameter. If the original material from which the wire is made is a rod 25 mm in diameter, calculate the longitudinal engineering strain and true strain that the wire has undergone during processing.
a mechanical engineer who recently graduated with a masters degree is contemplating starting his own commercial heating
An air heater may be fabricated by coiling Nichrome wire and passing air in cross flow over the wire. Consider a heater fabricated from wire of diameter D=1 mm, L= 2m, electrical resistivity rho=10^-6 ohms, thermal conductivity k=25W/mK, and emiss..
determine the time it takes for the ball to start rolling without slip and its speed when it does so. In addition, determine the distance it travels before it starts rolling without slip. Assume (mu)K = 0.10.
a centrifugal compressor delivers 20 kgs of air at 0.32 mnm2 when running at 17500 rpm and absorbing 2800 kw. the inlet
a vapor-compression refregeration i.e. reverse rankine system circulates refrigerant 134a at a rate of 6kgmin. the
Calculate the polar moment of inertia of an assembly and using the result to predict the periodic time of a trifilar suspension of the assembly.
consider a combined gas-steam power plant. water for the steam cycle is heated in a well-insulated heat exchanger by
a satellite is in earth orbit with an altitude at perigee of 555.0 km and an altitude at apogee of 1200.0 km. a. what
a carnot heat pump cycle is executed in a steady-flow system with r-134a flowing at a rate of 0.216 kgs. the net power
a tie bars is to be made in two parts to facilitate adjustment in length during assembly. sketch the arrangements. draw
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