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svetoff [14.1K]
3 years ago
7

A bus decreases its speed

Physics
1 answer:
eduard3 years ago
7 0

Answer:

-6 km/h per minute

Explanation:

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Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams. How old is the sample of
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How many times did the original sample lose 50% of its radioactivity ?

-- Start with. . . . . . . . . . . . 12 grams.
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-- How long did it take to lose half, 4 times ?

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Joule ;)

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Hope this helps!

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