Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.
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When a ball thrown upward reaches its highest point, its velocity is? is still -9.8 m/s2. The acceleration due to gravity is always -9.8 m/s/s, regardless of the ball's velocity.
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<h2>Answer: 10,000 times
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Thomas Alva Edison was a North American scientist and inventor who is credited with the design of the electric bulb and many other patented inventions.
However, the bulb did not come out on the first attempt, and was sometimes questioned by his repeated "failures". But his patience and perseverance paid off, after approximately 10,000 attempts, he managed to obtain an incandescent bulb that would last for a long time.
It should be noted that Edison was once asked if he considered that he had had many failures before making the bulb work, hence his famous phrase:
<h2><em>“I have not failed 10,000 times—I’ve successfully found 10,000 ways that will not work.”
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That is why Edison is considered an example of perseverance.
