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Propagation of an Electromagnetic Wave
Electromagnetic waves are waves that can travel by the vacuum of outer space. Mechanical waves, not like electromagnetic waves, need the presence of a material medium within order to transport their energy from one location to another. Sound waves are examples of mechanical waves although light waves are instance of electromagnetic waves.
what is the tension in the string when the block is lifted at a steady speed when the weight weighs 4.5N and the distance is 90cm
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