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Electromagnetic waves can transfer energy without a(n). A) medium. B) electric field. C) magnetic field. D) change in either a magnetic or an electric field.
asked
May 15, 2017
Physics
high-school
2
answers
4
votes
184k
views
Which new technology of the 1800s had the greatest impact on cattle ranchers on the Great Plains? a. refrigerated rail cars b. steam-powered river boats c. McCormick reaper d. telegraph lines
asked
Dec 3, 2016
History
high-school
2
answers
5
votes
85.0k
views
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