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What is the difference between July and January temperatures in the Celcius scale? What is the difference between July and January temperatures in the Kelvin scale?
To what temperature must the strips be heated if they are to dissipate 1500 W of heat to a room at 25?C? Assume the strips dissipate heat from both sides.
If the outer surface of the tube has an emissivity of 0.9, and if it sees the surroundings at a temperature of 10oC, what is the net radiative heat transfer?
Knowing that a 66 kip axial force P is applied to the pipe. Determine the normal and sheering stresses in the directions respectively normal and tangential to the weld.
A pressurized oxygen tank contains 2.35 kg of oxygen. This tank is cylindrical in shape with a diameter of 20 cm and a height of 2 m. What is the specific volume of the oxygen?
The drag of these particles is measured by F_D = kV, where V is the instantaneous particle speed. Find the value of the constant k. Find the time required to reach 99% of the terminal speed.
Determine the current required to maintain the wire surface at 115 degree C. Also determine the rate of heat transferred from the wire.
The heat transfer coefficients in the inner tube and in the annulus are 4620 W/m2 * K and 1600 W/m2 * K respectively. Calculate the overall heat transfer coefficient and the surface area of the heat
Find (a) the change in specific volume of water between the surface and 7-km depth, (b) the specific volume at 7 km, (c) the specific weight at 7 km.
Its other surface is exposed to a fluid with TF equal to 50 degree C and hbar equal to 150W/(m2 degree C). Determine the rate of heat transfer per unit area and the surface temperature.
Use this information to determine the convection coefficient for heat transfer between the gas and the bead, assuming radiating surfaces are black.
The vertical motion of mass A is defined by the relation x=10sin(2t)+15cos(2t)+100. Determine (a) the position, velocity, and acceleration of A when t=1 , (b) the maximum velocity and acceleration
Find (a) total strain corresponding to yield strength, (b) what portion of the total strain in part 'a' is elastic and (c) what portion is plastic? (d) at a tensile stress of 42,000 psi the total te
A 200 lbf weight starts at reset and is accelerated to a speed by having 20,000 ft-lbf work done on it, knowing there is no heat transfer and the internal energy increases by 16 BTU. What is the ch
Find the net power output of this plant and the required mass flow rate of river water. The turbine and pump operate isentropically.
An aqueous ester hydrolysis reaction A -> B + C has k = 0.02 min-1 and an equilibrium constant of 10 with all concentrations in moles/liter.
Based upon a comparison of the calculated and measured average temperatures, which planet is most affected by radiation transfer in its atmosphere?
The upper half of the container holds steam (of density 5kg/m^3) while the lower half contains water (of density 1000 kg/m^3). What fraction of the overall mass is steam?
If the torsional stress in the bar is not to exceed 100 MPa when one end is twisted through an angle of 15degree, what must be the length of the bar?
If piston hits stops, what is its temp and pressure, at that instant? If it does not hit the stops, what is the final volume? What is the total work and heat (w &q)for the problem?
Calculate the span of a differential pressure transmitter that is mounted 10 inches below the bottom instrument tap on an open process tank that contains a liquid with a specific gravity of 1.1.
1.7 pound-mass of water fills a container whose volume is 3.7ft³. The pressure in the container is 70 psia. How do you calculate the total internal energy and enthalpy in the container?
The process begins with p1=250 kPa and v1=1.5m^3 and ends with p2=100kPa. Determine the final specific volume in m^3/kg. Plot the process on graph of pressure versus specific volume.
Accounting for the variation of specific heats,according to temperature determine the air temperature at the compressor exit, the back work ratio and the thermal efficiency.
Then calculate the annual cost to operate a 60-W, 75-W, and 100-W incandescent bulb and a 15-W compact fluorescent bulb. Assuming the average household operates six 60-W, four 75-W.