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Batteries could be used to supply the power for almost all electronic equipment if it were not for the high cost of the energy they provide compared to commercial power lines. Power supplies were once called battery eliminators, an apt name because they made it possible to use less expensive energy from a commercial power line where it is available. Batteries are still an appropriate and economical choice for portable equipment having modest energy requirements.

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Batteries could be used to supply the power for almost all electronic equipment if it were not for the high cost of the energy they provide compared to commercial power lines. Power supplies were once called battery eliminators, an apt name because they made it possible to use less expensive energy from a commercial power line where it is available. Batteries are still an appropriate and economical choice for portable equipment having modest energy requirements.

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Beaty, Donald. "Electrical power supply." The Gale Encyclopedia of Science, edited by K. Lee Lerner and Brenda Wilmoth Lerner, 5th ed., Gale, 2014. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2644030772/SCIC?u=mlin_c_leichs&xid=d20ea5ed. Accessed 28 Nov. 2017.

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"Energy transformations." World of Earth Science, edited by K. Lee Lerner and Brenda Wilmoth Lerner, Gale, 2007. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2641950152/SCIC?u=mlin_c_leichs&xid=347d627b. Accessed 28 Nov. 2017

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Every atom is comprised of two primary components, a central core and a cloud of electrons.The nucleus contains most of the atom's mass and its positive charge. The nucleus is made up of protons and neutrons. The cloud of electrons accounts for the atom's negative charge .

"Atomic Structure." World of Physics, Gale, 2001. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2434500024/SCIC?u=mlin_c_leichs&xid=8cc73c1c. Accessed 28 Nov. 2017.

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Topic\View All\DocumentSmallerLargerCeramic insulators covered in electricity World of Physics, 2001ListenCeramic insulators covered in electricity

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Topic\View All\DocumentSmallerLargerCeramic insulators covered in electricity World of Physics, 2001ListenCeramic insulators covered in electricity

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energy transformation is also called energy conversion.

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Charles Babbage started to work on the first computer/arithmetic machine in 1822. "Early model Apple computers." Gale Science in Context, Gale, 2016. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/NHGGWQ129942609/SCIC?u=mlin_c_leichs&xid=2377e498. Accessed 28 Nov. 2017.

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The explosion in computational capability has made it possible to understand and exploit the concepts of aerodynamics and to design improved wings for airplanes.
Datta, Sreela. "Aerodynamics." The Gale Encyclopedia of Science, edited by K. Lee Lerner and Brenda Wilmoth Lerner, 5th ed., Gale, 2014. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2644030036/SCIC?u=mlin_c_leichs&xid=74f559ea. Accessed 28 Nov. 2017.

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If a force is acting on and the body phase no acceleration, the body will experience a change in the appearance.

Electrical and magnetic forces can result in attraction or repulsion of an object. Now gravitational force results will only cause an attraction in the mass.

"Force." The Gale Encyclopedia of Science, edited by K. Lee Lerner and Brenda Wilmoth Lerner, 5th ed., Gale, 2014. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2644030927/SCIC?u=mlin_c_leichs&xid=7cdcca63. Accessed 28 Nov. 2017.

http://ic.galegroup.com/ic/scic/ImagesDetailsPage/ImagesDetailsWindow?disableHighlighting=true&p=SCIC&javax.portlet.action=viewMedia&u=mlin_c_leichs&contentModules=&action=1&prodId=SCIC&currPage=1&pageSize=20&total=17&documentId=GALE|CV2210044456&query=&limiter=&catId=GALE|AAA000010531&displayGroups=&source=fullList&sortBy=relevance,descending

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Pluto is a small planet in the solar system and is only two-thirds the size of Earth's moon. It has an unusual elliptical shape and was believed to be the outermost part of the solar system until 2006.

Beech, M., King, D. T., Jr., & Atkins, W. A. (2014). Pluto. In K. L. Lerner & B. W. Lerner (Eds.), The Gale Encyclopedia of Science (5th ed.). Farmington Hills, MI: Gale. Retrieved from http://libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2644031754/SCIC?u=mlin_c_leichs&xid=f9cdd2ff

Pluto from New Horizons. (2015). In Gale Science in Context. Detroit: Gale. Retrieved from http://libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/PC4205141985/SCIC?u=mlin_c_leichs&xid=1f1289fa

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theory that states the universe began as an explosion about 13.8 billion years ago

A light-year is the distance that light travels in one year: 5.88 trillion miles (9.46 trillion kilometers), or about 60,000 times the distance from the Earth to the sun.

Gilman, Larry. "Big bang theory." The Gale Encyclopedia of Science, edited by K. Lee Lerner and Brenda Wilmoth Lerner, 5th ed., Gale, 2014. Science in Context, libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/CV2644030266/SCIC?u=mlin_c_leichs&xid=7673689f. Accessed 28 Nov. 2017

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energy has many forms such as radiant kinetic and potential, each can be converted into other forms of energy

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energy has many forms such as radiant kinetic and potential, each can be converted into other forms of energy

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The density of an object is defined simply as the mass of the object divided by the volume of the object."Buoyancy." UXL Encyclopedia of Science, edited by Amy Hackney Blackwell and Elizabeth Manar, 3rd ed., UXL, 2015. libraries.state.ma.us/login?gwurl=http://link.galegroup.com/apps/doc/PC4205140912/SCIC?u=mlin_c_leichs&xid=b2c5850f. Accessed 28 Nov. 2017.