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natka813 [3]
3 years ago
10

Which of the following is a complex machine? 1) piano 2) bottle opener 3) shoehorn 4) doorknob

Physics
2 answers:
erastovalidia [21]3 years ago
7 0
I would say 1) piano because the doorknob is only the wheel and axle. 
xeze [42]3 years ago
5 0
1. piano. that is the answer is my mind
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