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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.
Find the value of the reduced volume both fluids would have at Tr = 3/2 and Pr = 3. Find the temperature, pressure and volume of each gas at Tr = 3/2 and Pr = 3.
A 600 MW coal-fired power plant has an overall thermal efficiency of 38%. It is burning coal that has a heating value of 12,000 Btu/lb, an ash content of 5%, a sulfur content of 3.0%, and a CO2 emis
Estimate the diffusion coefficient at 25°C of trace of ethanol in water and of traces of water in ethanol. Viscosity of water is 0.008937 g/cm-s, and 0.01074 g/cm-s for ethanol.
One-fouth kg of a gas contained within a piston-cylinder assembly undergoes a constant-pressure process at 5 bar beginning at v=0.20 m^3/kg. For the gas as the system, the work is -15 kJ. Determine
Air enters the compressor of a gas-turbine engine at 300K and 100 kPa, where it is compressed to 700 kPa and 580K. Heat is transferred to air in the amount of 950 kJ/kg before it enters the turbine.
A gas-turbine power plant operates on a simple ideal Brayton cycle with air as the working fluid. The air enters the compressor at 95 kPa and 290K and the turbine at 760 kPa and 1100K.