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KIM [24]
3 years ago
9

Walk in a straight line. Now stop. Did you accelerate? Explain

Physics
2 answers:
sasho [114]3 years ago
7 0
YES. If you where not moving and then suddenly started moving forward to walk in the straight line you did indeed accelerate at one point in your journey. And then when you stopped you where decelerating
Brums [2.3K]3 years ago
4 0

Answer;

It's about acceleration, right?

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The half-life of Co-55 is 175 hours. How much of a 4000 g of Cobalt-55 sample would be left after 525 hours?
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We know that whatever amount we start with, half of it decays and forms atoms of other elements in 175 hours.  So in order to figure out how much is left after 525 hours, we'll need to know how many half-lifes pass in that amount of time.

Well, (525 divided by 175) is exactly 3 half-lifes.  So this will be easy.

-- After 1 half-life . . .

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-- After the 2nd half-life . . .

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-- After the 3rd half-life . . .

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12.5% of 4,000g = (0.125 x 4,000g) = <em>500 g</em> .

============================================

<u>Another way</u>:

After 1 half-life, 1/2 is left.

After 2 half-lifes, 1/4 is left.

After 3 half-lifes, 1/8 is left.

1/8 of 4,000g = (4,000g/8) = <em>500 g </em>.

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