Why was the invention of the steel plow so important?
What will be an ideal response?
It allowed early farmers to break up the tough sod that had previously prevented pioneers from
cultivating the rich prairie soil.
You might also like to view...
To what datum is the centerline of the bore in B4 to be perpendicular?
Refer to Drawing Number 4190487 R0 and answer the following questions.
The USB 2.0 specification has a data transfer rate up to ____.
a. 60 Mbit/s b. 120 Mbit/s c. 240 Mbit/s d. 480 Mbit/s
Your chemical plant manufactures a chemical which has a constant heat capacity of CV = 3R, is in the gas phase at all process conditions, and can be modeled as an ideal gas as long as the pressure is below 5 atm. There is a point in the process where the compound is at P=2 atm and T=400 K, and must undergo a reduction in pressure to P=1 atm. Currently, this is done by a steady-state adiabatic throttling valve. Your boss has asked you to examine the possibility of replacing this valve with a turbine, so that some useful work can be obtained from the necessary drop in pressure. The efficiency of the turbine would be 75%.
A) In the current process, what is the temperature of the gas leaving the valve? B) How much work would the turbine produce for each mole of entering gas? C) What would be the actual temperature of the gas leaving the turbine?
A European candy manufacturing plant manager must select a new irradiation system to ensure the safety of specific ingredients, while being economical. The two alternatives available have the following estimates:
 FIGURE 1.png)
The company is in the 35% tax bracket and assumes classical straight line depreciation for alternative comparisons performed at an after-tax MARR of 6% per year. A salvage value of zero is used when depreciation is calculated; however, System B can be sold after 5 years for an estimated 10% of its first cost. System A has no anticipated salvage value. Determine which is more economical using an AW analysis worked by hand.