ten countries during 2011. (a) Based on the data in the graph, identify one of the fuel sources that in 2011 was intermediate in contribution among the ten countries in the amount of electricity generated.
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
The diagram below illustrates the electricity generation in ten countries during 2011.
(a) Based on the data in the graph, identify one of the fuel sources that in 2011 was intermediate in contribution among the ten countries in the amount of electricity generated.
(b) Based on the data in the graph, identify the country that produced a higher percentage of its electricity in 2011 from nonhydroelectric renewables than any other country.
(c) Based on the data in the graph, describe one environmental problem in South Korea that could result if its total electricity generation was increased by 10 percent with its most-used fuel source.
(d) Based on the data in the graph, propose a solution to reduce an environmental problem linked to the primary means of electricity generation in Brazil, other than reduced use of that resource.
(e) The ecological footprint of an average individual living in Canada is seven times larger than the ecological footprint of an average individual living in Brazil. Using the data provided in both the graph and table, make a claim that supports or refutes the hypothesis that the total ecological footprint of Canada is larger than that of Brazil.
(f) A conservationist group proposes that grocery stores sell food like flour, oats, and rice from bulk food bins in place of individually packaged quantities of these foods. They argue this action will reduce the ecological footprint of the community. Make a claim that supports or refutes the proposed bulk bin program as a way to reduce the ecological footprint of the community.
Transportation is another major contributor to an individual’s ecological footprint. In countries like the United States, passenger vehicles contribute to a range of environmental problems.
(g) Describe one regulatory practice that could reduce the effect of passenger vehicles on carbon dioxide in the atmosphere.
(h) Describe an additional benefit, other than reducing the air pollutant mentioned, that could result from the regulatory practice identified in part (g).
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