1. I think is letter b.
2. I thinks it's letter c.
I believe it is called centripetal force <span />
Supposing the carousel is rotating with constant speed, the movement is uniform angular motion.
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Answer: On December 20th, 1951 in Idaho, United States.
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The world's first experimental nuclear power plant was the Experimental Breeder Reactor Number One (EBR-I), which was built in a desert in Idaho, United States.
This reactor made history when, on December 20th, 1951, four 200-watt light bulbs were illuminated by means of atomic energy, specifically by nuclear fission reaction.