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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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