Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
Assume that the constant-volume specific heat of air remains constant at 0.720 kJ/kg-K. Taking the air as the system, determine for the process the Entropy change of the air, kJ/K.
Determine (e) the second-law efficiency of the cycle and the rate of exergy output with the exhaust gases when they are purged.
Find the probability the component will fail before t = 2 hours. What is the reliability of this component at t = 5 hours.
Assuming an exponential failure time distribution, construct a 95% confidence interval for the mean time between failures of the capacitors. Interpret the interval.
A smooth sheet metal duct of rectangular section (0.75ft by 2.5ft) is to be used. Determine the pressure drop (inches of water) for a 1000-ft horizontal duct section.
The minimum enclosed volume is 14% of the maximum enclosed volume. How much power will this engine produce when operated at 2500 rpm? Use constant specific heats at room temperature.
Draw a schematic of the multicomponent system at t=delta t. What is the amount of reversible work input to the pump in delta t time assume that the pump contracts due to thermal expansion.
Write out the full energy balance in delta t time (assuming Qloss, Pelect,in, Zin,water, Zout,H2, Zout,O2, and a change in control volume, delta Vcv, in delta t time at constant pressure).
Assume that the metabolism of glucose to pyruvate does not generate ATP. How much useable energy (heat) is generated? What is the efficiency of glycolysis in generating ATP (actual ATP generated over
If the handle is 1 in. in diameter and 1 ft long and the boat is moving at 20 mph, how much horsepower is required to pull the handle through the water?
What would be the exit temperature take into account the change in inside heat transfer resistance due to the flow rate change?
Determine the pipe diameter to achieve this flow, exactly. This requires four basic pipe and fluids equations including the Colebrook Equation to solve.
The density is 64 lbm/ft3, calculate the diameter (in) of the bubble. Assume the temperature is a balmy 80F (you are sitting on a Caribbean beach).
Assuming an arithmetic average particle size, what void fraction would be needed to agree with the published pressure drop?
The fluid density p, the fluid viscosity u, and the distance to the leading edge of the plate x. Express these variables in dimensionless form.
Determine the rotation speed (in RPM) if the test is to simulate braking a bicycle traveling at a speed of 20 km/hour. The wheel diameter (including the tire) is 70 cm.
How much heat does this surface deliver to the water circulating in the collector when solar radiation is incident on the surface at a rate of 600 W/m2.
Determine the coefficient of static friction between each ring and the shaft. Determine the coefficient of static friction between each ring and the shaft.
Calculate the pressure and temperature at the remaining three states of the Otto cycle: P2, T2, P3, T3, P4, T4. Calculate the thermal efficiency of the cycle.
Draw a T-s diagram of the cycle described here, with labels for the base and top of the chimney, for the air entering the heated area, and for the location at the height of the top of the chimney.
The operating temperature of SAE 50!oil ( p=890kg/m^3) is to be 40C. Calculate the pressure, coefficient of friction, absolute viscosity, kinematic viscosity, and frictional power loss.
Calculate (1) the material removal rate, (2) the tangential cutting force, and (3) the torque and power required for the operation.
Create a model of a turbine. Inputs are mass flow rate, Temp in, Press in, Press out, isentropic efficiency. Plot for 5 input pressures the power out vs isentropic efficiency.
At each stage, find pressure, temperature, specific volume, specific internal energy, and phase (sat. vap., L-V, etc.) Calculate net power output. Calculate heat transfer rate from solar collector to
Assuming that the rocket is only under the acceleration of gravity (i.e. neglect drag) after the engine burns out, find: The speed of the rocket at the end of powered flight The maximum altitude of