How did humans modify the environment to build railroads? Digital Public Library of America. Human modifications include paving over vegetated areas, constructing buildings, building bridges, draining wetlands, removing or adding trees, building dams, irrigating etc. How were Native Americans impacted by the construction of the transcontinental railroad? The construction of the Transcontinental Railroad had dire […]
What is the mechanical advantage of three pulleys?
What is the mechanical advantage of three pulleys? A 3:1 pulling on another 3:1 gives you a mechanical advantage of 9:1. A system that is neither simple or compound is a complex pulley system. The 5:1 shown is a complex system. As the mechanical advantage increases, the amount of rope that must be pulled through […]
What is the equilibrium wage in this labor market?
What is the equilibrium wage in this labor market? The equilibrium market wage rate is at the intersection of the supply and demand for labour. Employees are hired up to the point where the extra cost of hiring an employee is equal to the extra sales revenue from selling their output. Why does the Monopsonist […]
What is a feedback control system?
What is a feedback control system? A feedback control system is a system whose output is controlled using its measurement as a feedback signal. This feedback signal is compared with a reference signal to generate an error signal which is filtered by a controller to produce the system’s control input. Which is the output of […]
What is twinning in plastic deformation?
What is twinning in plastic deformation? In twinning each plane of atoms move through a definite distance and in the same direction. When a shear stress is applied the crystal will twin about the twinning plane in such a way that the region to the left of the twinning plane is not deformed where as […]
Why do engineers place tolerances on dimensions?
Why do engineers place tolerances on dimensions? Engineers place tolerance on dimensions to allow variances in an acceptable range in order to make a product function properly. The amount of tolerance depends on the degree of variations in a particular object. Why are tolerances used in engineering? Tolerance is the acceptable range for a physical […]
What are the water treatment methods?
What are the water treatment methods? Processes Chemical. Tanks with sand filters to remove precipitated iron (not working at the time) Physical. Sedimentation for solids separation that is the removal of suspended solids trapped in the floc. Physio-chemical. Biological. Desalination. Portable Water Purification. Boiler water treatment. Cooling water treatment. How do you purify wastewater? Four […]
What is technology and example?
What is technology and example? Technology is the way we apply scientific knowledge for practical purposes. It includes machines (like computers) but also techniques and processes (like the way we produce computer chips). In fact, a hammer and the wheel are two examples of early human technology. What is world technology? “The World Technology Network […]
What is bioremediation of soil?
What is bioremediation of soil? Bioremediation is a branch of biotechnology that employs the use of living organisms, like microbes and bacteria, in the removal of contaminants, pollutants, and toxins from soil, water, and other environments. Bioremediation is used to clean up oil spills or contaminated groundwater. What are some examples of bioremediation? Bioremediation companies […]
What is the difference between crystal structure and crystal system?
What is the difference between crystal structure and crystal system? Answer: A crystal structure is described by both the geometry of, and atomic arrangements within, the unit cell, whereas a crystal system is described only in terms of the unit cell geometry. For example, face-centered cubic and body-centered cubic are crystal structures that belong to […]