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The number average molecular weight of polystyrene is 250,000 g/mol. Compute the number average degree of polymerization (atomic weight of C= 12, H=1)
Compute the work and heat transfer per unit mass for each process in, kj/kg, and the entropy production, in kj/k, and determine the thermal efficiency of the cycle and compare to the Carnot efficiency
Iron titanate, FeTiO3, forms in the illmenite crystal structure that consists of an HCP arrangement of O2- ions. What fraction of the total octahedral sites will be occupied?
Determine the ratio of work delivered by the turbine to the work consumed by the pump. Assume the entire cycle to be reversible and the heat losses from the pump and the turbine to be negligible.
Determine the maximum axial compressive load P that can be supported by the column if a factor of safety of 1.9 with resect to failure by buckling is specified.
The heat transfer takes place through a boundary temperature of 25 C. Calculate: a) the mass flow rate of steam, and b) the rate of entropy production.
Determine (a) the velocity when x= 2m,(b) the position where the velocity is again zero,(c) the position where the velocity is maximum.
The cable that supports the elevator has a design load of 2500lb. Use the impulse momentum equation and determine the time it will take the elevator to stop?
Using the von Mises failure criterion, determine the maximum pressure of the gas inside the cylinder if yielding is to be avoided.
When operated at 2600 rpm, this engine produces 98 hp. Determine the rate of heat addition to this engine. Use constant specific heats at room temperature.
A different production line has 15 defectives in a sample of 40. Find a 95% Confidence Interval for the proportion of defectives coming off the production line.
95% relative humidity, and cools it to 40 degrees F at constant pressure. What volumetric flow rate of air into the device is needed to produce 10.0 gal/min of condensed water?
Calculate the bubble pressure and the composition of the vapor in equilibrium with a liquid containing 47% "A" assuming ideal solution behavior (i.e. Raoult's Law).
A minimum stress of -20 MPa (compressive stress), if a fatigue life 1.5*10^6 cycles is expected, determine the largest initial crack length that can be allowed.
A hectare is 10,000 m^2. An acre is 43,560 square feet. The UNC Charlotte main campus is 1080 acres in area. what then is the area of the main campus in hectares?
Assume kinetic and potential energy effects are negligible. Determine the change in specific entropy (kJ/kgK) from inlet to exit of the turbine.
Air in a piston-cylinder assembly, initially at 290 K and 100 kPa, undergoes two internally reversible processes in series. Determine the net specific work (kJ/kg) for the overall Process 1-2-3.
he cross section is 2 inches wide and 6 inches hight(vertical). Compute max shear stress that occurs in the bar near the load at the points.
Draw a system diagram and label all the components. Number the flow, starting with a 1 at the pump inlet. Draw a T-s diagram for the isentropic and actual process.
Saturated vapor at 8 MPa enters the turbine of a 100 MW (net power) vapor power plant. Draw a sketch of the system and a T-s diagram for the isentropic and actual process.
After cooling under equilibrium conditions to room temperature, the amount of in the mixture decreases to 68%. Sketch the equilibrium phase diagram.
Consider a mixture of 50 mol% n-pentane and 50 mol% n-butane at 14 bar. What is the dew-point temperature? What is the composition of the first drop of liquid?
We now heat the water from a 200 C reservoir, so the volume becomes five times the initial value. Find the total heat transfer and the entropy generation.
Show that it can be transformed into another differential equation with constant coefficients.if we make the substitution px+q=e^t. change the derivatives from dy/dx to dy/dt.
Find: Addendum, Dedendum, Clearance, Circular pitch, Circular tooth thickness, Base pitch, Length of action, Profile contract ratio, and Module.