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The string dips a constant 9 degrees from the horizontal and has a lenght of 70 cm from its pivot point. A) Determine the angular speed w of the object (in rpm)?
What is the entropy change associated with the following process? Combustion of methane at standard amospheric pressure with 20% excess air in an adiabatic reactor when all reactants.
A .5 kg steel (Cp = .5 kJ/kg-K) kivet cools from 800K to 300K upon being installed in a riveted building structure. What is the total entropy change of the Universe (system + surroundings) during t
The specific enthalpy of steam is 2974 kJ/kg at 260ºC and 7 bar and 2860 kJ/kg at 200ºC and 4 bar. Use the open-system energy balance to calculate the exit steam velocity.
Determine the required balloon volume if a) The balloon is filled with hot air at 400 K. b) The balloon is filled with helium at ambient temperature.
Given that the steam tables provide the most accurate value for the variable being evaluated, calculate the percentage error committed in parts b) and c) above.
Determine a) the initial temperature, b) the final pressure and c) the change in total internal energy for the given process. Show the process on a T-v diagram.
A two-phase liquid-vapor of water has a temperature of 300 ºC and a quality of 75%. The mixture occupies a volume of 0.05 m3. Determine the masses of saturated liquid and vapor present, in kg.
10kg of nitrogen is heated from 20 degrees celcius to 250 degrees celcius. Determine the total amount of heat required when this is done in (a) a constant-volume process and (b) an isobaric process
The diffusion coefficient is 6.9x10^-11 m^2/s. What is the diffusion flux from the surface into the plate? Assume a linear concentration profile within the plate.
Estimate Young's modulus E for the material, assuming that it remains linear elastic at this load. If Poisson's ratio is 0.33, how much will the diameter change under this load?
Find the loop transfer function and the input-output transfer function. Does the Nichols diagram enter the "6 db" line on Nichols diagram.
Write the general equation (defining equation) for the average velocity for flow in a cylindrical annulus. Do not even try to solve the general equation. Define terms and draw a figure if that will
Calculate the maximum velocity of fluid flowing in laminar flow in a cylindrical pipe 60 feet long and 2 inches in diameter when the average velocity is 9.8 feet per second.
Calculate how long it will take the pump to drain the tank (stopping at the bottom of the tank). In addition, calculate the initial and final pressure at the pump suction due to the fluid height.
Knowing that the coefficient of restitution between the sphere and the wedge is e 5 0.6, determine (a) the angle u that the inclined face of the wedge makes with the horizontal, (b) the energy lost
A piston cyl device initially contains 2.8 lbm of water , 1.2 lbm of which are in a liquid form at a pressure of 140 psia. Determine initial and final values of temperature, specific volume and specif
The vessel is heated until the water pressure reaches 8 MPa. Determine the following properties of the water at the final state: (a) temperature; (b) enthalpy; (c) internal energy.
Heat is added to the gas under constant pressure until the volume doubles. Calculate the initial volume and final temperature of the air.
Calculate the enthalpy change of the nitrogen during the process and the work done by the nitrogen against the piston and the surrounding atmosphere if the process is internally reversible.
If the specific surface energy for aluminum oxide is 0.90 J/m2 and its modulus of elasticity is (393 GPa), compute the critical stress required for the propagation of an internal crack of length 0.
1 lb of steam in a rigid vessel is initially at 900 psia and 1400 F. The steam is cooled until the temperature drops to 550 F. The amount of heat removed from the steam is ____ BTU?
A maximum flow rate of 6 CFS is available for a river model. This corresponds to 30,000 CFS for the prototype. What is the scale of the model in terms of the prototype size?
The spillway section is 40 feet high, its crest length is 60 feet and the maximum discharge is 3,000 CFS when the head on the crest of the spillway is 5 feet. Using a model scale of 1:10, calculate
The ideal gases are separated by a partition, which is free to move and allows heat transfer across it, but can store no energy. Determine the final equilibrium temperature and pressure, assuming con