Answer:
Explanation:
The <em>half-life </em>of a radioisotope, in this case carbon-14, is the time that a sample requires to reduce its amount to half, and it is a constant for every radioisotope (it does not change with the amount of sample).
Then, the formula for the remaining amount of a radioisotope is:
Where:
- A is the final amount of the element,
- A₀ is the initial amount of the element,
- A/A₀ is ratio of remaining amount to the original amount, and
- n is the number of half-lives elapsed
The number of half-lives for carbon-14 elapsed for the dinosaur fossil is:
- n = 68 million years / 5730 years ≈ 11,867
Then, A / A₀ = (1/2)ⁿ = (1/2)¹¹⁸⁶⁷ ≈ 0.00000 .
The number is too small, and when you round to five decimal places the result is zero. That is why carbon-14 cannot be used to date dinosaur fossils, given that they are too old.
Answer:
0.947 rad or 54.27 degrees
Explanation:
Suppose the collision is elastic, meaning the momentum is preserved.
Before the collision and the second ball has no momentum
Right after the collision and the first bast ball has no momentum.
Therefore momentum of the first baseball has been transferred to the 2nd ball
After the collision, the second ball would gained kinetic energy, which then would be transferred to potential energy once it reaches its highest point:
By the law of energy conservation:
By law of energy conservation:
So at its highest point, the ball is 0.562 m from the lowest point. Since the ball is hanging on a 1.35 m string, we can calculate the vertical distance from there to the swinging point:
1.35 - 0.562 = 0.788 m
Finally, the angle that string makes with the vertical at the highest point is
Answer:
* positive repulsion, which makes the electrons move as far away as possible
* Attraction with the core atomizes
he analysis is the foundations of quantum theorizing
Explanation:
Electrons are deposited in an atom following two principles.
* positive repulsion, which makes the electrons move as far away as possible
* Attraction with the core atomizes
The mathematical model used for the analysis is the foundations of quantum theorizing
Answer:
demagnetization answer☝️☝️☝️