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They bounce a spot of light off a (distant) object and measure the time it takes to bounce back.

Knowing the speed of light, the distance is Time times Speed.

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List a following devices that use electromagnetism to work?

Some devices that use electromagnetism to work include electric motors, generators, transformers, solenoids, and magnetic resonance imaging (MRI) machines.


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An automobile has several devices that can cause it to undergo acceleration. Some of the key devices include the engine, transmission, throttle, and fuel injection system. These devices work together to control the vehicle's speed and acceleration.


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