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If we were told that the water will reach a temperature of 46 degrees Celcius if the stirrer was 100% efficient in this situation, what is the actual efficiency of our stirrer?
Estimate the force of the roof at the opening pressures for internal pressure and for vacuum. -oil storage tank has a flat, horizontal, circular roof 120 feet in diameter.
The relationship between pressure and volume during the process is p = AV^-1 + B, where A = 0.06 bar * m^3 and B = 3.0 bar. For the O2, determine (a) the initial and final pressures, each in bar, an
An ice chest is constructed of 0.4 mm thick plain-carbon steel plate, a 1.9 cm thick layer of styrofoam {k=0.033 W/(m *C)} and a 0.65 cm thick fiber glass liner.
A vertical shaft whose cross sectional area is 0.8 cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas pressure is 3 bar
Estimate the magnitude of the force, in both lbf and N, exerted by a seat belt on a 200 lb driver during a frontal collision that decelerates a car from 10 mi/h to rest in 0.1 s.
If the temperature of the water is increased by 50°C, what is the pressure? Assume that the coefficients of compressibility and thermal expansion are constant
A steel plate is to be attached to a support with three bolts. The plate is 50 mm wide and 11.2 mm thick and the yield strength of the steel is 250 MPa. The ultimate bearing strength of the bolts is
What are the mean and standard deviation of their displacements from origin after 5 min? What is the important mechanism for small particles moving in the air?
Why do you think it is important to control the position of a DC motor? Provide two examples for position control of electric motors?
An orthopedic called "Mend-a-bone" is made of an extracellular matrix extract plasticized with glycerol (MW=92) to help surgeons shape it easily.
Why do materials that have the same composition and crystal structures have the same modulus of elasticity (E) regularless of the cold work or heat treated condiditons?
An ideal Brayton cycle with regeneration has a pressure ratio of 10. Air enters the compressor at 300K and the turbine at 1200K. If the effectiveness of the regenerator is 100 percent, determine the
There are a reservoir at point zero and another one 80 meter higher. They are 1km from eachother. The upper reservoir has a capacity of 40 000m3. The pipe diameter is 700mm.
A following process expands the gas at constant pressure to three times the initial volume. What is the specific work in the combined process?
The pump of a water distribution system is powered by a 6-kW electric motor whose efficiency is 95%. The water flow rate through the pump is 18L/s. The elevation difference across the pump is neglig
A piston-cylinder device initially contains 0.35-kg of steam at 3.5 MPa, superheated by 7.4°C. Now the steam loses heat to the surroundings and the piston moves down, hitting a set of stops at w
What is the Maximum height if a column of concrete that can support its own weight? Does the radius of the column matter?
Saturated water vapor at 350*C is heated at a constant pressure until its volume has doubled. Determine the final temperate using the ideal gas equation of state, the compressibility charts, and st
Portable electric heaters are commonly used to heat small rooms. Explain the energy transformation involved during the heating process.
A ductile metal wire of uniform cross section is loaded in tension until it just begins to neck. Assuming that volume is conserved, derive a differential expression relating the true stress to the t
An air-standard dual cycle has a compression ratio of 9. At the beginning of compression, p1=100kPa, T1=300K, and V1=14L. The heat addition is 22.7 kJ, with one half added at constant volume and one
A can of soft drink at room temperature is put into the refrigerator so that it will cool. Would you model the can of soft drink as a closed system or open system? Explain.
At 45 degrees celsius latitude, the gravitational acceleration as a function of elevation. Determine the height above sea level where the weight of a subject will decrease by 1 percent.