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  3. 1. why is the safety feature of a garage door open

1. Why is the safety feature of a garage door opener mounted about 10 inches off...

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Physics

1. Why is the safety feature of a garage door opener mountedabout 10 inches off the floor rather than higher?

2.Why do photons have to be massless?

Answer & Explanation Solved by verified expert
4.0 Ratings (789 Votes)
1 All openers must include a second safety reversing feature such as photoelectric eyes These are installed near the floor Once the invisible beam is broken the door reverses automatically    See Answer
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