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If a cylinder is maintained at 70 degrees C (5 cm dia.) and loses heat to the surrounding air (30 degrees C) by natural convection, what's the heat transfer rate per unit length of the cylinder?
Calculate the work output and the heat supplied per kg of steam for the plant, assuming idea processes and neglecting the feed pump term. Calculated also the specific steam consumption and the cycle
If the oil tank is insulated, so there is no heat transfer from the oil to the surroundings, how much new disorder is produced in this process? By how much did the entropies of the oil and the forgi
Calculate the number of cycles until failure for the second stress considering cumulative fatigue. Calculate the cumulative effect by either the Miner or the Manson method, explain your choice.
Stray heat transfer and kinetic and potential energy effects are negligible. Assuming the ideal gas model for the air, determine the maximum theoretical pressure at the exit, in lbf/in.2
Find (a) the final temperature in each container (K), (b) the final mass in each container (kg), and (c) the total change in entropy (kJ/K).
The system is extremely clean and quiet, and the flow stays laminar until a noisy air compressor is turned on in the laboratory. Then it suddenly goes turbulent. Calculate the ratio of turbulent to
Determine the specific work and heat transfer associated with the process (kJ/kg). Determine the change in specific entropy of the system (kJ/kg-K)
If you double the velocity without changing the circulation or the doublet strength, what happens to the size of the cylinder? What happens to the lift?
Calculate the force P required to give the bucket an upward acceleration of .5 m/s^2 from rest if it contains 20 kg of water at that time. the empty bucket has a mass .6 kg.
One kg of steam is contained at 200 degC and 1 MPa in a closed, deformable vessel and is expanded to 50 kPa in a reversible, isothermal process. Find the work done and the heat transfer in this pro
Determine by how much the tank dimensions (tank length and tank diameter) change under the combined action of the pressure and axial force.
A 20-kg steel forging at 350degC is quenched by immersing it in a 250 L tank of oil that is initially at 20degC. How much new disorder is produced in this process? By how much did the entropies of the
If the steam undergoes a reversible adiabatic expansion, until a pressure of 600 kPa is reached, what is the exit velocity of the mass?
If the flow rate out of the tank is 10 liters/minute, determine the time (in seconds) to obtain a density of 1010 kg/m^3. Assume freshwater is 1000 kg/m^3, and seawater is 1030 kg/m^3.
Determine the local acceleration, the convective acceleration, and the total acceleration at point 1 and 2 at t = 0. Total acceleration is between 80-100 m/s^2 at x =0, 150-200 m/s^2 at x =2m.
An incompressible fluid flows horizontally in the x-y plane with a velocity given by u = 33 (y/h)1/2, where y and h are in meters and h is a constant.
The water falls through a vertical distance of 150 ft from a reservoir to the turbines. Calculate the power output, and express it in the units of both hp and kW. The density of water is 1.94 slug/f
The air moves in cross flow over the pipe at 15m/s, while the outer surface of the pipe is maintained at 100C. What is the rate of heat transfer from the pipe per unit length?
Calculate the plate surface temperature, Ts(L), and the local convection coefficient, hx(L), at the trailing edge, x = L. Calculate the total rate of heat transfer Q per unit plate width.
A copper wire having diameter d = 4 mm is bent into a circle and held with ends just touching. If the maximum possible strain in the copper is .0024 what is the shortest length of wire that can be u
The air can be modeled as an ideal gas. Determine the mass, in kg and pressure, in kPa in the container after 20 seconds if the temperature is 20 degree C.
If the mass center of the body is displaced 3 cm to the left of its equilibrium position and released from rest, describe the motion as a function of time.
Calculate the Reynolds number and determine whether the flow is laminar of turbulent. The Viscosity and density of blood are approximately 4 cP and 1.06Mg/m^3, respectively.