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What is the Human Development Index? Suppose the world population in year 2100 will be 9 billion people. Assume the amount of energy needed to provide each person an acceptable quality of life is 10
How long does this coal reserve of US will last if all coal is used to generate electricity? Assume the efficiency of converting coal to electricity is 35%.
Find the ideal Otto cycle efficiency and compare with the values of efficiency calculated from mpg rating. Comment on the results.
The angle through which the wires supporting the block rotate as a result of the impact is measured and determined to be 7 degrees. What is the bullet's velocity?
The water level in the basement is now sinking about 0.4 mm/min. What is the flow rate (L/s) from the storm into the basement? The basement is 7.6 by 6 m.
Which cup will be the most stable on an unstable surface such as a pillow, a bed, or a couch? Cup with tissue paperWhich cup will most easily hold the load of a book or a folder?
At the instant when the water depth is 0.6 m, the flow rate from the tank is observed to be 4 kg/s. Determine the rate of change of water level at this instant.
A hydraulic dredge is used to dredge sand from a river bottom. Estimate the thrust necessary to keep the boat stationary. Assume the specific gravity of the sand/water mixture is SG=1.2.
Determine the heat supplied to the air in the heat exchanger Q. H, in kW. Assuming the air in the heat exchanger acts as a heat sink having an average temperature of 25°C, determine the minimum
Prove that the process is irreversible. In modeling this rocess treat the egg as the system and assume the passage of sufficient time for the egg to return to its inintial temperature.
What is the rpm of the fan three seconds after it is turned on? How many revolutions has it made at this time? What is the tip velocity of the blades at this time is the overall diameter is 12 inche
An automobile can accelerate at the rate of 1.5m/s2 and can decelerate at 7m/s2. if driver never exceeds the speed limit of 88km/hr what is the minimum time for him to start from rest and stop his
Determine the minimum amount of heat that must be extracted from the tank of water by any device to accomplish the required cooling of the house. No other sources of energy are available.
Discuss the effect of pressure ratio on the following parameters a) Thermal efficiency versus pressure ratio b) Back work ratio versus pressure ratio.
The second turbine exhausts at 480kPa to the regenerator. All the expansion and compression processes are isentropic and using constant specific heats at room temperature, determine the compressor
Determine the coefficients a, b, and c by applying the boundary conditions to the prescribed temperature distribution. Use the results to calculate and plot the temperature distribution.
Write an expression for the conduction heat rate, qx(x). Use this expression to determine the temperature distribution T(x) and qualitatively sketch the distribution for T(0) > T(L).
A mass of 6 kg moving horizontally with velocity v impacts the top of the post. Determine the largest speed for which the maximum normal stress in the pipe does not exceed 180 MPa.
A dragster comes off the start line with an acceleration of 4 m/s2. The acceleration increases uniformly from 4 m/s2 to 10m/s2 over 3 seconds, then remains constant to the finish line (500m). Find: t
What is the velocity of the canoe when it hits the bottom? Give one reason why this may easiest be handled by an energy approach. Use energy methods to determine this velocity.
The aircraft drops the supplies from a point 100 m above the peak of the mountain, while traveling horizontally with a velocity of 300 km/hr. How far down the mountain will the supplies strike and h
Determine the convection coefficient between the wall and water. Also show that the steady state temperature distribution has form T(x) = ax^2 + bx + c.
If the inside surface of the furnace front is subjected to uniform heat flux of 5kW/m^2 and the outer surface has an emissivity of .30, determine the inside surface temperature of the furnace front.
Determine (a) the time at which the velocity will be zero, (b) the position and distance traveled by the particle at that time, (c) the acceleration of the particle at that time, (d) the distance tr
Write the governing equation for the temperature distribution, T(x). what is the name of this equation? solve the equation for the general solution in terms of (qx''/k).