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A thermometer placed in the tank indicates that the air temperature at the final state is 77 degrees C. Determine a) the mass of air that has entered the tank and b) the amount of heat transfer.
Determine the velocity of each block just after collision and the distance between the blocks when they stop sliding. The coefficient of kinetic friction between blocks and the plane is uk=.3
For mating hinges on the sign, specify the class of fit, the limits of size, and the limits of clearance. Use the basic hole method. Also, explain the difference if you were asked to use the basic s
Find the desired radius and mass of the absorber if the absorber is to not exceed an angular deflection amplitude of 30 degrees when the engine is running at 750 rpm.
If the initial value of N is 1 million/L, what values of k would allow the initial rate of change of N to be positive? What Euler's method numerical simulation equation would you use to model this pro
Determine for the turbine (a) the mass flow rate, in kg/s, (b) the power developed by the turbine, in MW, (c) the rate at which entropy is produced, in kW/K, and (d) the isentropic turbine efficienc
Calculate the volume flow rate through the turbine [m3/s]. What is the optimum rotation rate [rpm] of the wheel (for maximum power)?
vinegar Is a solution of acetic acid dissolved in water. a 5.54 g sample of vinegar was neutralized by 30.10ml of .100 M NaOH.
Determine the temperature of the bottom plate and the ratio of the convective to radiative heat fluxes for 1 2 0.5. Evaluate air properties at T 350 K.
The mass flow rate is 0.5 kg/s. Plot each of the following versus the turbine exit temperature in C: the rate of exergy destruction in the turbine, in kW
Consider the 2D inviscid flow over a body of some known shape. Write down general expressions for the total aerodynamic force(per unit depth perpendicular to the plane)
Consider entropy balance equation for human engines. Humans loose heat at the rate of 80 W from the body which is uniformly at 37 C. Calculate entropy generated within human body in W/K.
Calculate the Nusselt number and the convective heat transfer coefficient for water at a bulk temperature of 32oC flowing at a velocity of 1.5 m/s through a duct of 25.4 mm inside diameter.
Calculate the friction factor and the heat transfer coefficient assuming the flow is both hydrodynamically and thermally fully developed. Evaluate air properties at 350 K.
Compare calculated tensile stress with allowable tensile stress and find the absolute value of elongation of the rod for the stress equal to allowable.
Assume MACRS depreciation for the special tools and a 39% income tax rate. If the company wants a 12% after-tax rate of return, is this a desirable investment?
Neglecting changes in kinetic and potential engery and assuming steady state operation, determine the river water temperature downstream of the plant, in degrees C.
The valve is opened long enough to fill the tank to a pressure of 500 psia. Determine; The final temperature of the steam in the tank, in degrees F.
An iron-carbon alloy gear is being hardened by carburization at 1000oC. Calculate the time in hours necessary to increase the carbon content to 0.45 wt% at 2 mm below the surface.
The concentration of hydrogen on the other side of the membrane is 9.93 x 10-6 wt%. Calculate the concentrations of hydrogen in the iron on both sides of the membrane in kgm-3.
The ratio of the exit area to the inlet is 8. Assuming the ideal gas model for air and using variable specific heats, determine: the temperature at the exit, in degrees R.
Assuming the air behaves as an ideal gas with cp=1.005 KJ/kg*K, determine the mass flow rate of air, in kg/min. Kinetic and potential energy effects are negligble.
If the house were heated instead by a heat pump with a COP of 2.4, how much money would the homeowner have saved in that month assuming 8.5 cents/kWh for electricity?
Plot the maximum efficiency of a nuclear power plant as a function of the maximum allowable temperature in the reactor core.