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Lynna [10]
3 years ago
15

How could you use a model to show the cause-and-effect relationship between Earth's rotation and the apparent motion of the star

s across the night sky?
Chemistry
2 answers:
Masteriza [31]3 years ago
7 0

Question:

How could you use a model to show the cause-and-effect relationship between Earth's rotation and the apparent motion of the stars across the night sky?

Answer:

Gravity? or density because of the pull from the sun.

fomenos3 years ago
5 0
Using a model you can rotate the objects seeing it’s rotation if you know that the earth rotates opposite of the sun then you know that the stars move with the sun by a gravitational pull.
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How old is a bone if it now .3125 of C-14 when it originally had 80.0g of C-14
Taya2010 [7]
<h3>Answer:</h3>

42960 years

<h3>Explanation:</h3>

<u>We are given;</u>

  • Remaining mass of C-14 in a bone is 0.3125 g
  • Original mass of C-14 on the bone is 80.0 g
  • Half life of C-14 is 5370 years

We are required to determine the age of the bone;

  • Using the formula;
  • Remaining mass = Original mass × 0.5^n , where n is the number of half lives.

Therefore;

0.3125 g = 80.0 g × 0.5^n

3.90625 × 10^-3 = 0.5^n

  • Introducing logarithm on both sides;

log 3.90625 × 10^-3 = n log 0.5

Solving for n

n = log 3.90625 × 10^-3 ÷ log 0.5

   = 8

  • Therefore, the number of half lives is 8
  • But, 1 half life is 5370 years
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Age of the rock = 5370 years × 8

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Thus, the bone is 42960 years old

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