Physics, 27.01.2020 01:31 michaelgold1
Electromagnetic and mechanical waves both transfer energy. how is an electromagnetic wave different from a mechanical wave?
an electromagnetic wave has frequency, and a mechanical wave does not.
an electromagnetic wave is made of atoms, and a mechanical wave is not.
an electromagnetic wave can travel in a vacuum, and a mechanical wave cannot.
electromagnetic waves have frequencies that never change, and mechanical wave frequencies change.
Answers: 2
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Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?
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Physics, 23.06.2019 06:20
Which statements best describe energy? check all that apply. the total amount of energy in the universe remains constant. the total amount of energy in the universe changes constantly. energy cannot be converted from one form to another. energy can be converted from one form to another. energy cannot be created or destroyed. energy can be created or destroyed.
Answers: 1
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