how do scientists know that black holes exist A. by running experiments on the sun B. by observing objects and light around blac
2 answers:
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Answer: 7.5 rev/s
Explanation:
We are given the angular velocity a helicopter's main rotor blades:
However, we are asked to express this in the International Systrm (SI) units. In this sense, the SI unit for time is second (
):
