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Do you agree with their stated "friction resistance" for 100 ft of horizontal pipe? What is the "friction resistance" in terms used in our course?
Determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 20 psia.
Determine expressions for the local and convective components of acceleration in the x and y directions. What is the magnitude and direction of the velocity and acceleration at point x = y = 2 m at
Derive an expression for the steady-state temperature, T_b, at the base of the rod (x=0). The exposed portion of the rod should be modeled as an infinitely long fin.
Determine the cycle's coefficient of performance. Use constant specific heat at room temperature. Consider problem 1 again but this time the compressor and turbine have isentropic efficiencies of 87
If in vickers hardness test a sample is tested at 30kgf load and length of diagonals measured were 0.497 mm and 0.502 mm then what is the vickers hardness number for that sample?
The steel frame (E=200GPa) shown has a diagonal brace BD with an area of 1920mm^2. Determine the largest allowable load P if the change in length of member BD is not to exceed 1.6 mm.
For the water, evaluate the heat transfer, in kJ, for each stage of heating. Ignore Kinetic Energy and Potential Energy effects.
At the compressor inlet, the gas temperature is 30°C. If kinetic and potential energy effects are negligible, determine the gas temperature at the compressor exit.
One kilogram of carbon dioxide (CO2) gas (M = 44.01 kg/kmol) is filled in a frictionless piston-cylinder assembly. Is the ideal gas model applicable for both the initial and final states of the CO2 g
The refrigerant-134a changes from saturated liquid to saturated vapor at 70 C during the addition process. Determine the net work output of this engine per cycle.
If the R-134a changes from saturated liquid to saturated vapor during the heat addition process, determine the maximum possible net work output of this engine?
Design a crank-rocker mechanism with a time ratio of Q, throw angle of Δσmax, and time per cycle of t. Specify the link lengths and the crank speed.
The water exit the firehose with sufficient velocity to travel 30 meter vertically. D2=10cm, D1= 15cm. Neglect friction, what is the axial force required to keep the nozzle stationary?
Using the ideal gas model with constant specific heats evaluated at 350K, determine the mass of nitrogen that escapes, in kg, and the amount of energy transfer by heat, in kJ.
Calculate the temperatures when the water rate is reduced by 30%. What is the total heat transfer under this new condition?
Determine the rate of entropy production, in kW/K, (a) for the tank and its contents as the system, and (b) for an enlarged system including the tank and enough of the nearby surroundings for the he
The heat transferred over the first 6 cm of the plate is 20 W per unit depth of the plate. How much heat is transferred over the first 54 cm of the plate?
What is the water (heat capacity 4.2 Kj/kg) flow rate in order to condense 0.23 Kg/s of Freon 12? Calculate the area of the heat exchanger. If the water rate is reduced to half, how much Freon can b
It is known that atmospheric air flows parallel to the flat surface (U∞ = 25 m/s, T∞ =20 C), and that the flow induces a drag force of 1N. What is the electrical power needed?
If the friction force on the metal foil surface is 0.3 N, determine the surface temperature of the metal foil. Evaluate the fluid properties at 100 deg C.
Find the value of heat transfer coefficient that will ensure that the surface temperature will not exceed 45oC. What is the heat flux through the insulation?
Estimate the heat flux through the wall for following conditions: heat transfer coefficients in the inside and outside as 10 and 65 W/m2 K respectively; inside and outside temperatures are 20oC and
Calculate the time the boy must wait until the surface temperature of the marbles reaches 35degreeC. The thermal conductivity and heat diffusivity of the glass marble arc 0.78 W/m degree C and 3.4 t
For one-dimensional , steady state conduction in cylindrical or spherical shell without heat generation, is the radical heat flux independent of radius? Is the radical heat rate independent of radi