Carson’s <span>“Silent Spring” influenced the
environmental movement </span>as it presents a view of nature compromised by synthetic pesticides,
especially DDT. The pesticides not only kill bugs but also threaten bird and
fish populations, and eventually sicken children. Much of the data and case
studies that Carson drew from weren’t new but she was the first to consolidate
them all for the general public and to draw blunt conclusions. This book was so
revolutionary that by the end of the twentieth century, it took its place on
lists of the best books of the century or even of all time.
Answer:
A
Explanation:
a small force results in a large acceleration
Explanation:
1) the diagonal force times the sine of the angle it makes will give you the vertical component or y component . use this to get the vertical components of all the diagonal forces . add all the vertical components as well as the vertical forces together
2) the diagonal force times the cosine of the angle it makes gives the horizontal component or x component. do this to get the x component of all the diagonal forces.
add all the x components as well as the horizontal forces together to get the final x component
3)using the triangle of vectors, the resultant force is calculated
sum of y component = 3.2N
sum of x component= 5.7N
resultant force = 6.5N
Answer:
east
Explanation:
15km east
_______________
X________
8km west
so you are where the xX is so you are still in the eastward direction
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.